fix(utils): improve isArrayLike robustness and type safety #7573
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- Added null and primitive guards to prevent invalid inputs - Excluded strings and functions from being treated as array-like - Ensured length is finite and non-negative using defensive checks - Replaced direct property access with safer Reflect operations - Improved TypeScript type narrowing for stronger type safety
- Added null, primitive, and string guards to prevent invalid inputs - Ensured `length` is finite and non-negative using Reflect-based property access - Excluded functions and strings from being treated as array-like - Improved type narrowing for safer inference in Observable input detection - Added comprehensive unit tests covering edge cases (null, string, function, negative length, valid array-like)
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