memory allocated to hold B<n> elements if B<n> is positive. The next B<n> calls
to sk_TYPE_insert(), sk_TYPE_push() or sk_TYPE_unshift() will not fail or cause
memory to be allocated or reallocated. If B<n> is zero or less than zero, no
memory allocated to hold B<n> elements if B<n> is positive. The next B<n> calls
to sk_TYPE_insert(), sk_TYPE_push() or sk_TYPE_unshift() will not fail or cause
memory to be allocated or reallocated. If B<n> is zero or less than zero, no