set_error_handler() can now be called with
an argument to reset the error handler.
When called with
NULL, set_error_handler() and
set_exception_handler() now return the previous error
or exception handler, respectively.
pack() and unpack() now support the
Z format character for null-padded strings.
unpack()'s a format no longer
strips trailing null bytes, bringing it into line with Perl's behaviour.
unpack()'s A format now strips all
trailing ASCII whitespace, bringing it into line with Perl's behaviour.
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