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is_valid_index

container.abstract_array.is_valid_index

check if argument is a valid index in this array.

Unlike for general Sequences, this performs in O(1).
0.095dev (2025-08-15 12:02:22 GIT hash 301b5b75e77076d091b38f555473f9f0e31e5b5c built by fridi@fzen)