reverse()
public
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static VALUE
rb_ary_reverse_m(VALUE ary)
{
long len = RARRAY_LEN(ary);
VALUE dup = rb_ary_new2(len);
if (len > 0) {
VALUE *p1 = RARRAY_PTR(ary);
VALUE *p2 = RARRAY_PTR(dup) + len - 1;
do *p2-- = *p1++; while (--len > 0);
}
ARY_SET_LEN(dup, RARRAY_LEN(ary));
return dup;
}