[iOS][non-icu] HybridGlobalization investigate behavioural changes

[mkhamoyan]

• Go through test cases market as ActiveIssue for PlatformDetection. IsHybridGlobalizationOnApplePlatform in https://github.com/dotnet/runtime/blob/main/src/libraries/Common/tests/Tests/System/StringTests.cs and investigate if possible to have same behaviour as ICU compare.

• Check Turkish 'I' comparison and check "\u0131" casing.

  • For ICU, we have similar logic implemented at

    runtime/src/native/libs/System.Globalization.Native/pal_casing.c

    Line 135 in 01aa3d9

    dstCodepoint = ((srcCodepoint == (UChar32)0x0069) ? (UChar32)0x0130 : u_toupper(srcCodepoint));

  • and

    runtime/src/native/libs/System.Globalization.Native/pal_casing.c

    Line 91 in 01aa3d9

    dstCodepoint = ((srcCodepoint == (UChar32)0x0131) ? (UChar32)0x0131 : u_toupper(srcCodepoint));

• Check DateTime related behavioural changes.

In case not possible document behavioural differencies between ICU and Hybrid.

Tests have been marked as ActiveIssue in hybrid mode here #95260

• https://github.com/search?q=repo%3Adotnet%2Fruntime+https%3A%2F%2Fgithub.com%2Fdotnet%2Fruntime%2Fissues%2F95338&type=code

Contributes to #80689

[ghost]

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Issue Details

---

Go through test cases market as ActiveIssue for PlatformDetection.IsNotHybridGlobalizaionOnOSX in https://github.com/dotnet/runtime/blob/main/src/libraries/Common/tests/Tests/System/StringTests.cs and investigate if possible to have same behaviour as ICU compare.
In case not possible document behavioural differencies between ICU and Hybrid.
Tests have been marked as ActiveIssue in hybrid mode here #95260

Contributes to #80689

Author:	mkhamoyan
Assignees:	mkhamoyan
Labels:	area-System.Globalization, os-ios
Milestone:	9.0.0