(core) - allow for multiple concurrent mutations of the same key #2189
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Resolves #2184
Summary
When we are dealing with mutations of let's say
files
then the key could be equal for different sets of variables, this PR moves mutations from key-checking to referential equality of theoperation
itself, this means that every request will have it's own result-source. This allows for us to repeat a set of mutations with different inputsThis was triggered by the discussion in #2183
Set of changes