Improve IsExactInstanceOfType error message for NULL values#7418

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copilot/improve-isexactinstanceoftype-error-message

Commits on Feb 16, 2026

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Add NULL detection to IsExactInstanceOfType error message and update tests

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Remove accidentally committed backup files

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Add proper punctuation before NULL message when userMessage doesn't end with punctuation

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Use trimmed message consistently when adding NULL indicator

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Improve punctuation handling - handle empty messages and use index access

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