[bug #68121] convert isequal to built-in function for performance

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Update of bug #68121 (group octave):

                Severity:              3 - Normal => 2 - Minor
                 Summary: plea to make isequal built-in => convert isequal to
built-in function for performance

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Follow-up Comment #1:

confirming that isqeual is in m-code in the current versions of octave.  

A quick look shows there are many type specific code paths in that function,
which is probably why 'it works' in m-code has been considered good enough as
the conversion complexity may be nontrivial. 

that said, in the meantime can you share what sort of data you're passing to
isequal? and in what construct you're calling the function? it may be there
are some things that can be done with the current code to at least alleviate
some of your current performance penalty.


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