Handle indirect zvals and use up-to-date properties in SplFixedArray::__serialize

Closes GH-10925.

Revert "Handle indirect zvals in SplFixedArray::__serialize"

This reverts commit e6989382296250b1983422c0b8730cd773f26ea7.

Handle indirect zvals in SplFixedArray::__serialize

Closes GH-10925.

Fix GH-10907: Unable to serialize processed SplFixedArrays in PHP 8.2.4

The properties table can also contain numeric entries after a rebuild of
the table based on the array. Since the a

Fix GH-10907: Unable to serialize processed SplFixedArrays in PHP 8.2.4

The properties table can also contain numeric entries after a rebuild of
the table based on the array. Since the array can only contain numeric
entries, and the properties table can contain a mix of both, we'll add
the numeric entries from the array and only the string entries from the
properties table. To implement this we simply check if the key from the
properties table is a string.

Closes GH-10921.

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