in reply to Wrong result for "length keys %$hashref"?
The documentation of length answers your question:
'length Returns the length in characters of the value of EXPR. If EXPR is omitted, returns length of $_. Note that this cannot be used on an entire array or hash to find out how many elements these have. For that, use "scalar @array" and "scalar keys %hash" respectively.'
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Seekers of Perl Wisdom