> +[[ -n ${PYTHON_COMPAT_ALLOW_EXTRA_IMPLS[*]} ]] &&

Without string check:

[[ ${#PYTHON_COMPAT_ALLOW_EXTRA_IMPLS[@]} -gt 0 ]]

> +     _PYTHON_ALL_IMPLS+=( ${PYTHON_COMPAT_ALLOW_EXTRA_IMPLS} )
>  readonly _PYTHON_ALL_IMPLS

Once array, always array:

_PYTHON_ALL_IMPLS+=( ${PYTHON_COMPAT_ALLOW_EXTRA_IMPLS[@]} )

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