In the B language this can be considered a bug fix.
In the .control language this is a severe change
and breaks backwards compatibility.
In all three languages 'numparam' 'B' and '.control' we now have
ln to the base e
log to the base e
log10 to the base 10
Thus log and log10 is now consistent
with the vast majority of programming languages.
ln is merely for convenience.
very few other languages have it.
I'd like to discourage its usage.