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StrlenFunctionReturnTypeExtension: Cleanup `instanceof ConstantString` #3681

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StrlenFunctionReturnTypeExtension: Cleanup `instanceof ConstantString`

StrlenFunctionReturnTypeExtension: Cleanup `instanceof ConstantString` #3681

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Summary
Jobs
- Check for typos
Run details
- Usage
- Workflow file

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Run time

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Job	Run time
Check for typos	7s
	7s

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