In preparation for future versions of the Array API standard,
"make_strategies_namespace()" now accepts an optional "api_version"
argument, which determines the version conformed to by the returned
strategies namespace. If "None", the version of the passed array
module "xp" is inferred.
This release also introduces "xps.real_dtypes()". This is currently
equivalent to the existing "xps.numeric_dtypes()" strategy, but exists
because the latter is expected to include complex numbers in the next
version of the standard.
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