multipolynomial __call__ not consistent

[robertwb]

sage: parent(RR['x,y'].gen(1)(0,CC.0))
Complex Field with 53 bits of precision
sage: parent(RR['x,y'](0)(0,0))
Integer Ring
sage: parent(RR['x,y'](0)(0,CC.0))
Integer Ring
sage: parent(RR['x,y'](1)(0,CC.0))
Real Field with 53 bits of precision

sage: parent(QQ['x,y'](1)(0,CC.0))
Rational Field
sage: parent(QQ['x,y'](0)(0,0))
Rational Field
sage: parent(QQ['x,y'](0)(0,CC.0))
Rational Field
sage: parent(QQ['x,y'].gen(1)(0,CC.0))
Complex Field with 53 bits of precision

The result should not depend on the specific polynomial, only on its parent and the parent of the inputs.

Univariate ones get it right:

sage: sage: parent(RR['x'](0)(0))
Real Field with 53 bits of precision
sage: sage: parent(RR['x'](0)(CC.0))
Complex Field with 53 bits of precision

Component: algebra

Stopgaps: todo

Issue created by migration from https://trac.sagemath.org/ticket/5544

[sagetrac-cwitty]

comment:1

According to this definition, there are bugs in univariate polynomials as well:

sage: parent(QQ['x'](0)(1))
Integer Ring
sage: parent(QQ['x'].gen(0)(1))
Rational Field

[sagetrac-jakobkroeker]

Stopgaps: todo