Make array_pad's $length warning less confusing (#10149)

Remove array_pad's arbitrary length restriction

The error message was wrong; it *is* possible to use a larger length.
Fu

Make array_pad's $length warning less confusing (#10149)

Remove array_pad's arbitrary length restriction

The error message was wrong; it *is* possible to use a larger length.
Furthermore, there is an arbitrary restriction on the new array's
length.

Fix both by checking the length against HT_MAX_SIZE.

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