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Definition
/**
* Create a ValueNormalizer for converting arbitrary PHP values to Telemetry attribute types.
*
* The normalizer handles:
* - null → 'null' string
* - scalars (string, int, float, bool) → unchanged
* - DateTimeInterface → unchanged
* - Throwable → unchanged
* - arrays → recursively normalized
* - objects with __toString() → string cast
* - objects without __toString() → class name
* - other types → get_debug_type() result
*
* Example usage:
* ```php
* $normalizer = value_normalizer();
* $normalized = $normalizer->normalize($value);
* ```
*/
value_normalizer() : ValueNormalizer
