eql?

static VALUE
method_eq(VALUE method, VALUE other)
{
    struct METHOD *m1, *m2;

    if (TYPE(other) != T_DATA
        || RDATA(other)->dmark != (RUBY_DATA_FUNC) bm_mark)
        return Qfalse;
    if (CLASS_OF(method) != CLASS_OF(other))
        return Qfalse;

    Data_Get_Struct(method, struct METHOD, m1);
    Data_Get_Struct(other, struct METHOD, m2);

    if (m1->oclass != m2->oclass || m1->rclass != m2->rclass ||
        m1->recv != m2->recv || m1->body != m2->body)
        return Qfalse;

    return Qtrue;
}