=over

=item push ARRAY,LIST
X<push> X<stack>

Treats ARRAY as a stack, and pushes the values of LIST
onto the end of ARRAY.  The length of ARRAY increases by the length of
LIST.  Has the same effect as

    for $value (LIST) {
	$ARRAY[++$#ARRAY] = $value;
    }

but is more efficient.  Returns the number of elements in the array following
the completed C<push>.

=back