UpValues associated to Atoms are not taken into account in evaluations.

[mmatera]

Description

Differently than in WMA, Upvalues assigned to Atom types, like Real are not taken into account in evaluation

How to Reproduce

In[1]:= Unprotect[Real]; Real/:F[x_Real]:=x;F[3.]
Out[1]= 3.

$mathics -c 'Unprotect[Real]; Real/:F[x_Real]:=x;F[3.]'  

Output Given

Got F[3.]

Expected behavior

If the Upvalue were taken into account, the result -like in WMA- would be
3.

Additional context

We would like that atoms like ByteArray use UpValues for defining rules associated to Normal or Part, to make the code more modular.