I think that the following behavior is wrong.
sage: K=QQ['t,s']
sage: L=QQ['t0,t1,s0,s1']
sage: L.inject_variables()
Defining t0, t1, s0, s1
sage: Hom(K,L)([t0+t1,s0]).register_as_coercion()
sage: L.coerce_map_from(K)
Ring morphism:
From: Multivariate Polynomial Ring in t, s over Rational Field
To: Multivariate Polynomial Ring in t0, t1, s0, s1 over Rational Field
Defn: t |--> t0 + t1
s |--> s0
sage: K.0*L(1)
t0 + t1 #GOOD
sage: L(K.0)
t0 #BAD
Even if a register a coercion between K and L, L.__call__ is making a
conversion instead. Is this the expected result or is it a bug.
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