The module author determinate what belongs to the API.
Normally, yes. Does that still apply to core modules like List::Util? I'd always assumed that authors gave up a certain measure of control in exchange for having their module distributed as a fundamental part of the Perl standard library
It's up to the author. See http://perl5.git.perl.org/perl.git/blob_plain/HEAD:/Porting/Contract
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In reply to Re^3: On the rejected additions to List::Util by ysth
in thread On the rejected additions to List::Util by metaperl

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