CoCoA » CoCoALib

Currently CoCoALib does not permit automatic promotion with operators like +=.

This means that one cannot do, for instance, f /= content(f);
even though f = f/content(f); works just fine. This feel inconsistent!

There is the question about whether to permit the LHS to be promoted automatically.
At the moment I cannot think of a situation where this would be convenient/useful
[but that alone is not sufficient to exclude the possibility]. If we do forbid it,
then again we have a situation where a = a+b; has (slightly) different behaviour
from a +=b;