Realisations of Range#=== in ruby18 and ruby19

gistfile1.rb

# implementation of Range#=== in 1.8.7 - it was the same method as Range#include?:
<<-EOS
static VALUE
range_include(range, val)
    VALUE range, val;
{
    VALUE beg, end;

    beg = rb_ivar_get(range, id_beg);
    end = rb_ivar_get(range, id_end);
    if (r_le(beg, val)) {
        if (EXCL(range)) {
            if (r_lt(val, end)) return Qtrue;
        }
        else {
            if (r_le(val, end)) return Qtrue;
        }
    }
    return Qfalse;
}
EOS

# so when it was called after aliasing original include - it was ok
# rails3, ruby 1.8.7:

(1..5).include? (2..4)
# => true 
(1..5) === (2..4)
# => false 

# But in ruby19 it was rewritten and Range#=== is just caller for original include method from C source:
<<-EOS
static VALUE
range_eqq(VALUE range, VALUE val)
{
    return rb_funcall(range, rb_intern("include?"), 1, val);
}
EOS

# And now if we do aliasing on include?, Range#=== will call new include? method instead of old realisation
# rails3, ruby19:

(1..5).include? (2..4)
# => true 
(1..5) === (2..4)
# => true