coerce(p1) public

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static VALUE
nurat_coerce(VALUE self, VALUE other)
    if (RB_TYPE_P(other, T_FIXNUM) || RB_TYPE_P(other, T_BIGNUM)) {
        return rb_assoc_new(f_rational_new_bang1(CLASS_OF(self), other), self);
    else if (RB_TYPE_P(other, T_FLOAT)) {
        return rb_assoc_new(other, f_to_f(self));
    else if (RB_TYPE_P(other, T_RATIONAL)) {
        return rb_assoc_new(other, self);
    else if (RB_TYPE_P(other, T_COMPLEX)) {
        if (k_exact_zero_p(RCOMPLEX(other)->imag))
            return rb_assoc_new(f_rational_new_bang1
                                (CLASS_OF(self), RCOMPLEX(other)->real), self);
            return rb_assoc_new(other, rb_Complex(self, INT2FIX(0)));

    rb_raise(rb_eTypeError, "%s can't be coerced into %s",
             rb_obj_classname(other), rb_obj_classname(self));
    return Qnil;
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