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

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Follow-up Comment #32, bug #68121 (group octave):=0A=0ARe-based to after co=
de restructuring (so it will not apply to pre Octave 12, I=0Aguess). Found =
and fixed a couple bugs and made it into CSET.=0A=0A(file bug68121_isequal_=
vm_20260624_220.cset)=0A=0ADmitri.=0A-- =0A=0A=0A(file #58753)=0A=0A    ___=
____________________________________________________=0A=0AAdditional Item A=
ttachment:=0A=0AName: bug68121_isequal_vm_20260624_220.cset Size: 70KiB=0A=
=0A<https://file.savannah.gnu.org/file/bug68121_isequal_vm_20260624_220.cse=
t?file_id=3D58753>=0A=0A=0A    AGPL NOTICE=0A=0AThese attachments are serve=
d by Savane. You can download the corresponding=0Asource code of Savane at=
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9142870.tar.gz=0A=0A=0A    ________________________________________________=
_______=0A=0AReply to this item at:=0A=0A  <https://savannah.gnu.org/bugs/?=
68121>=0A=0A_______________________________________________=0AMessage sent =
via Savannah=0Ahttps://savannah.gnu.org/=0A
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