fix save settings

[mgefimov]

WithSettings.save_settings introspects __init__ to discover setting names,
but only looked at getfullargspec(...).args. After dcfb454#diff-b78b80c1401f36ffbc9ab4e51d9bdc3e6c5cec943c3031f2eb3788d35f368bbaR463 GenericPrivateTracker migrated
to keyword-only signatures, so the saved settings dict was always {}

Fix: include spec.kwonlyargs alongside spec.args[1:]

before

after

[coveralls]

Coverage Report for CI Build 25593672514

Coverage remained the same at 67.675%

Details

• Coverage remained the same as the base build.
• Patch coverage: 2 of 2 lines across 1 file are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	1686
Covered Lines:	1141
Line Coverage:	67.67%
Coverage Strength:	3.85 hits per line

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💛 - Coveralls

[idlesign]

Thank you. Merged.