diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4047742..74675d5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -15,5 +15,3 @@ repos:
       hooks:
         - id: isort
 
-default_language_version:
-  python: python3.11
diff --git a/poetry.lock b/poetry.lock
index 19dc232..945b95b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,335 +1,212 @@
-[[package]]
-name = "appdirs"
-version = "1.4.4"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
-optional = false
-python-versions = "*"
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
 [[package]]
 name = "atomicwrites"
-version = "1.4.0"
+version = "1.4.1"
 description = "Atomic file writes."
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+files = [
+    {file = "atomicwrites-1.4.1.tar.gz", hash = "sha256:81b2c9071a49367a7f770170e5eec8cb66567cfbbc8c73d20ce5ca4a8d71cf11"},
+]
 
 [[package]]
 name = "attrs"
-version = "21.2.0"
+version = "22.2.0"
 description = "Classes Without Boilerplate"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit"]
-docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
-
-[[package]]
-name = "backports.entry-points-selectable"
-version = "1.1.0"
-description = "Compatibility shim providing selectable entry points for older implementations"
-category = "dev"
-optional = false
-python-versions = ">=2.7"
-
-[package.dependencies]
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
-
-[package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-flake8", "pytest-cov", "pytest-black (>=0.3.7)", "pytest-mypy", "pytest-checkdocs (>=2.4)", "pytest-enabler (>=1.0.1)"]
-
-[[package]]
-name = "black"
-version = "21.7b0"
-description = "The uncompromising code formatter."
-category = "dev"
 optional = false
-python-versions = ">=3.6.2"
-
-[package.dependencies]
-appdirs = "*"
-click = ">=7.1.2"
-dataclasses = {version = ">=0.6", markers = "python_version < \"3.7\""}
-mypy-extensions = ">=0.4.3"
-pathspec = ">=0.8.1,<1"
-regex = ">=2020.1.8"
-tomli = ">=0.2.6,<2.0.0"
-typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\""}
-typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
+python-versions = ">=3.6"
+files = [
+    {file = "attrs-22.2.0-py3-none-any.whl", hash = "sha256:29e95c7f6778868dbd49170f98f8818f78f3dc5e0e37c0b1f474e3561b240836"},
+    {file = "attrs-22.2.0.tar.gz", hash = "sha256:c9227bfc2f01993c03f68db37d1d15c9690188323c067c641f1a35ca58185f99"},
+]
 
 [package.extras]
-colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.6.0)", "aiohttp-cors (>=0.4.0)"]
-python2 = ["typed-ast (>=1.4.2)"]
-uvloop = ["uvloop (>=0.15.2)"]
+cov = ["attrs[tests]", "coverage-enable-subprocess", "coverage[toml] (>=5.3)"]
+dev = ["attrs[docs,tests]"]
+docs = ["furo", "myst-parser", "sphinx", "sphinx-notfound-page", "sphinxcontrib-towncrier", "towncrier", "zope.interface"]
+tests = ["attrs[tests-no-zope]", "zope.interface"]
+tests-no-zope = ["cloudpickle", "cloudpickle", "hypothesis", "hypothesis", "mypy (>=0.971,<0.990)", "mypy (>=0.971,<0.990)", "pympler", "pympler", "pytest (>=4.3.0)", "pytest (>=4.3.0)", "pytest-mypy-plugins", "pytest-mypy-plugins", "pytest-xdist[psutil]", "pytest-xdist[psutil]"]
 
 [[package]]
 name = "bump2version"
 version = "1.0.1"
 description = "Version-bump your software with a single command!"
-category = "dev"
 optional = false
 python-versions = ">=3.5"
-
-[[package]]
-name = "cfgv"
-version = "3.3.0"
-description = "Validate configuration and produce human readable error messages."
-category = "dev"
-optional = false
-python-versions = ">=3.6.1"
-
-[[package]]
-name = "click"
-version = "8.0.1"
-description = "Composable command line interface toolkit"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-colorama = {version = "*", markers = "platform_system == \"Windows\""}
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+files = [
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+]
 
 [[package]]
 name = "colorama"
-version = "0.4.4"
+version = "0.4.5"
 description = "Cross-platform colored terminal text."
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+files = [
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+]
 
 [[package]]
 name = "coverage"
-version = "5.5"
+version = "6.2"
 description = "Code coverage measurement for Python"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-
-[package.extras]
-toml = ["toml"]
-
-[[package]]
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-category = "dev"
-optional = false
-python-versions = ">=3.6, <3.7"
-
-[[package]]
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-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "filelock"
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-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "flake8"
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-category = "dev"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-
-[package.dependencies]
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-pyflakes = ">=2.3.0,<2.4.0"
-
-[[package]]
-name = "identify"
-version = "2.2.13"
-description = "File identification library for Python"
-category = "dev"
 optional = false
-python-versions = ">=3.6.1"
+python-versions = ">=3.6"
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 [package.extras]
-license = ["editdistance-s"]
+toml = ["tomli"]
 
 [[package]]
 name = "importlib-metadata"
-version = "4.6.4"
+version = "4.8.3"
 description = "Read metadata from Python packages"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
+files = [
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+]
 
 [package.dependencies]
 typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
 perf = ["ipython"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
-
-[[package]]
-name = "importlib-resources"
-version = "5.2.2"
-description = "Read resources from Python packages"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
-
-[package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy"]
+testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pep517", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy", "pytest-perf (>=0.9.2)"]
 
 [[package]]
 name = "iniconfig"
 version = "1.1.1"
 description = "iniconfig: brain-dead simple config-ini parsing"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "mccabe"
-version = "0.6.1"
-description = "McCabe checker, plugin for flake8"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "mypy-extensions"
-version = "0.4.3"
-description = "Experimental type system extensions for programs checked with the mypy typechecker."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "nodeenv"
-version = "1.6.0"
-description = "Node.js virtual environment builder"
-category = "dev"
 optional = false
 python-versions = "*"
+files = [
+    {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
+    {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
+]
 
 [[package]]
 name = "packaging"
-version = "21.0"
+version = "21.3"
 description = "Core utilities for Python packages"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "packaging-21.3-py3-none-any.whl", hash = "sha256:ef103e05f519cdc783ae24ea4e2e0f508a9c99b2d4969652eed6a2e1ea5bd522"},
+    {file = "packaging-21.3.tar.gz", hash = "sha256:dd47c42927d89ab911e606518907cc2d3a1f38bbd026385970643f9c5b8ecfeb"},
+]
 
 [package.dependencies]
-pyparsing = ">=2.0.2"
-
-[[package]]
-name = "pathspec"
-version = "0.9.0"
-description = "Utility library for gitignore style pattern matching of file paths."
-category = "dev"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-
-[[package]]
-name = "platformdirs"
-version = "2.2.0"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.extras]
-docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
-test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
+pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
 
 [[package]]
 name = "pluggy"
-version = "0.13.1"
+version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.6"
+files = [
+    {file = "pluggy-1.0.0-py2.py3-none-any.whl", hash = "sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3"},
+    {file = "pluggy-1.0.0.tar.gz", hash = "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159"},
+]
 
 [package.dependencies]
 importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
-
-[[package]]
-name = "pre-commit"
-version = "2.14.0"
-description = "A framework for managing and maintaining multi-language pre-commit hooks."
-category = "dev"
-optional = false
-python-versions = ">=3.6.1"
-
-[package.dependencies]
-cfgv = ">=2.0.0"
-identify = ">=1.0.0"
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
-importlib-resources = {version = "*", markers = "python_version < \"3.7\""}
-nodeenv = ">=0.11.1"
-pyyaml = ">=5.1"
-toml = "*"
-virtualenv = ">=20.0.8"
+testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "py"
-version = "1.10.0"
+version = "1.11.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "pycodestyle"
-version = "2.7.0"
-description = "Python style guide checker"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "pyflakes"
-version = "2.3.1"
-description = "passive checker of Python programs"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+files = [
+    {file = "py-1.11.0-py2.py3-none-any.whl", hash = "sha256:607c53218732647dff4acdfcd50cb62615cedf612e72d1724fb1a0cc6405b378"},
+    {file = "py-1.11.0.tar.gz", hash = "sha256:51c75c4126074b472f746a24399ad32f6053d1b34b68d2fa41e558e6f4a98719"},
+]
 
 [[package]]
 name = "pyparsing"
-version = "2.4.7"
+version = "3.0.7"
 description = "Python parsing module"
-category = "dev"
 optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+python-versions = ">=3.6"
+files = [
+    {file = "pyparsing-3.0.7-py3-none-any.whl", hash = "sha256:a6c06a88f252e6c322f65faf8f418b16213b51bdfaece0524c1c1bc30c63c484"},
+    {file = "pyparsing-3.0.7.tar.gz", hash = "sha256:18ee9022775d270c55187733956460083db60b37d0d0fb357445f3094eed3eea"},
+]
+
+[package.extras]
+diagrams = ["jinja2", "railroad-diagrams"]
 
 [[package]]
 name = "pytest"
-version = "6.2.4"
+version = "6.2.5"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "pytest-6.2.5-py3-none-any.whl", hash = "sha256:7310f8d27bc79ced999e760ca304d69f6ba6c6649c0b60fb0e04a4a77cacc134"},
+    {file = "pytest-6.2.5.tar.gz", hash = "sha256:131b36680866a76e6781d13f101efb86cf674ebb9762eb70d3082b6f29889e89"},
+]
 
 [package.dependencies]
 atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
@@ -338,7 +215,7 @@ colorama = {version = "*", markers = "sys_platform == \"win32\""}
 importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
 packaging = "*"
-pluggy = ">=0.12,<1.0.0a1"
+pluggy = ">=0.12,<2.0"
 py = ">=1.8.2"
 toml = "*"
 
@@ -349,9 +226,12 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 name = "pytest-cov"
 version = "2.12.1"
 description = "Pytest plugin for measuring coverage."
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+files = [
+    {file = "pytest-cov-2.12.1.tar.gz", hash = "sha256:261ceeb8c227b726249b376b8526b600f38667ee314f910353fa318caa01f4d7"},
+    {file = "pytest_cov-2.12.1-py2.py3-none-any.whl", hash = "sha256:261bb9e47e65bd099c89c3edf92972865210c36813f80ede5277dceb77a4a62a"},
+]
 
 [package.dependencies]
 coverage = ">=5.2.1"
@@ -359,409 +239,46 @@ pytest = ">=4.6"
 toml = "*"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
-
-[[package]]
-name = "pyyaml"
-version = "5.4.1"
-description = "YAML parser and emitter for Python"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
-
-[[package]]
-name = "regex"
-version = "2021.8.21"
-description = "Alternative regular expression module, to replace re."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "six"
-version = "1.16.0"
-description = "Python 2 and 3 compatibility utilities"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
 
 [[package]]
 name = "toml"
 version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
-category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-
-[[package]]
-name = "tomli"
-version = "1.2.1"
-description = "A lil' TOML parser"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[[package]]
-name = "typed-ast"
-version = "1.4.3"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
-category = "dev"
-optional = false
-python-versions = "*"
+files = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
 
 [[package]]
 name = "typing-extensions"
-version = "3.10.0.0"
-description = "Backported and Experimental Type Hints for Python 3.5+"
-category = "dev"
+version = "4.1.1"
+description = "Backported and Experimental Type Hints for Python 3.6+"
 optional = false
-python-versions = "*"
-
-[[package]]
-name = "virtualenv"
-version = "20.7.2"
-description = "Virtual Python Environment builder"
-category = "dev"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-
-[package.dependencies]
-"backports.entry-points-selectable" = ">=1.0.4"
-distlib = ">=0.3.1,<1"
-filelock = ">=3.0.0,<4"
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-importlib-resources = {version = ">=1.0", markers = "python_version < \"3.7\""}
-platformdirs = ">=2,<3"
-six = ">=1.9.0,<2"
-
-[package.extras]
-docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)"]
-testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "packaging (>=20.0)"]
+python-versions = ">=3.6"
+files = [
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+    {file = "typing_extensions-4.1.1.tar.gz", hash = "sha256:1a9462dcc3347a79b1f1c0271fbe79e844580bb598bafa1ed208b94da3cdcd42"},
+]
 
 [[package]]
 name = "zipp"
-version = "3.5.0"
+version = "3.6.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
+files = [
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+]
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["func-timeout", "jaraco.itertools", "pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy"]
 
 [metadata]
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+lock-version = "2.0"
 python-versions = "^3.6.2"
-content-hash = "38f5e061038910a578ae0efaa163b938898949f60bc8973fcd585714d3aedc08"
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diff --git a/pyproject.toml b/pyproject.toml
index a8da379..55d70af 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,16 +11,13 @@ repository = "https://github.com/rabbit-aaron/ragdoll.git"
 python = "^3.6.2"
 
 [tool.poetry.dev-dependencies]
-black = "^21.7b0"
 pytest = "^6.2.4"
-flake8 = "^3.9.2"
 pytest-cov = "^2.12.1"
 bump2version = "^1.0.1"
-pre-commit = "^2.14.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.black]
-target-version = ["py36", "py37", "py38", "py39"]
+target-version = ["py36", "py37", "py38", "py39", "py310", "py311"]
diff --git a/ragdoll/base.py b/ragdoll/base.py
index d531adf..4025a3c 100644
--- a/ragdoll/base.py
+++ b/ragdoll/base.py
@@ -1,14 +1,14 @@
 import abc
 from typing import Any, Mapping, Optional, Type, Union
 
-from ragdoll import errors, utils
+from ragdoll import errors
 
 
 class BaseEntry(abc.ABC):
 
     _NOT_SET = object()
     DEFAULT_EXPORT = False
-    source: dict
+    source: Mapping
 
     def __init__(
         self,
@@ -89,11 +89,7 @@ def __init__(cls: Type["BaseSetting"], *args, **kwargs):
 class BaseSetting(metaclass=SettingMeta):
 
     auto_configure = True
-
-    @abc.abstractmethod
-    @utils.classproperty
-    def source(cls) -> Mapping:  # pragma: no cover
-        raise NotImplementedError
+    source: Mapping
 
     @classmethod
     def configure_entry(cls, entry: BaseEntry, name: str, value: str):
diff --git a/ragdoll/env.py b/ragdoll/env.py
index fb4a54f..31957f3 100644
--- a/ragdoll/env.py
+++ b/ragdoll/env.py
@@ -1,7 +1,7 @@
 import os
 import typing
 
-from ragdoll import errors, utils
+from ragdoll import errors
 from ragdoll.base import BaseEntry, BaseSetting
 
 __all__ = ["EnvSetting", "BaseEnvEntry", "StrEnv", "BoolEnv", "IntEnv"]
@@ -13,8 +13,6 @@ def get_raw_value(self) -> str:
 
     def __set_name__(self, owner: typing.Type["EnvSetting"], name: str):
         super().__set_name__(owner, name)
-        if not owner.case_sensitive:
-            self._name = name.lower()
 
 
 class StrEnv(BaseEnvEntry):
@@ -68,15 +66,4 @@ def __get__(self, *args, **kwargs) -> bool: ...
 
 
 class EnvSetting(BaseSetting):
-    case_sensitive = True
-    _source: typing.Optional[typing.Mapping] = None
-
-    @utils.classproperty
-    def source(cls) -> typing.Mapping:
-        if not cls._source:
-            if cls.case_sensitive:
-                cls._source = os.environ
-            else:
-                cls._source = {k.lower(): v for k, v in os.environ.items()}
-
-        return cls._source
+    source = os.environ
diff --git a/tests/test_env/test_bool_env.py b/tests/test_env/test_bool_env.py
index 3368b6b..d685363 100644
--- a/tests/test_env/test_bool_env.py
+++ b/tests/test_env/test_bool_env.py
@@ -1,7 +1,7 @@
 import pytest
 
 from ragdoll import errors
-from ragdoll.env import EnvSetting, BoolEnv
+from ragdoll.env import BoolEnv, EnvSetting
 
 
 def test_bool_env(monkeypatch):
diff --git a/tests/test_env/test_str_env.py b/tests/test_env/test_str_env.py
index 9046397..792bd96 100644
--- a/tests/test_env/test_str_env.py
+++ b/tests/test_env/test_str_env.py
@@ -4,7 +4,7 @@
 from ragdoll.env import EnvSetting, StrEnv
 
 
-def test_str_env_case_sensitive(monkeypatch):
+def test_str_env(monkeypatch):
     monkeypatch.setenv("FOO", "FOO")
     monkeypatch.setenv("BAR", "BAR")
 
@@ -16,20 +16,6 @@ class MyEnvSetting(EnvSetting):
     assert MyEnvSetting.bar is None
 
 
-def test_str_env_case_insensitive(monkeypatch):
-    monkeypatch.setenv("FOO", "FOO")
-    monkeypatch.setenv("BAR", "BAR")
-
-    class MyEnvSetting(EnvSetting):
-        case_sensitive = False
-
-        FOO = StrEnv()
-        bar = StrEnv()
-
-    assert MyEnvSetting.FOO == "FOO"
-    assert MyEnvSetting.bar == "BAR"
-
-
 def test_str_env_default_not_in_choice():
     with pytest.raises(AssertionError):
         StrEnv(default_value="foo", choices={"hello", "world"})