*narg*
Typo respectively wrong. I won't use

$is_my_class = defined($object) && $object->isa('My::Class');
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because if $object is defined but not blessed...

I'll use

$is_my_class = eval { $fd->isa('My::Class') };
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although normally (and I don't know why) I try to avoid 'eval'.
And although I'm not sure if I like this statement.
k