A reference implementation isn't really enough either though. Think about Perl, which is implementation defined, vs Python, which is specification defined.
Python is much more successful (it really ate Perl's lunch), and less of a moving target, because of this. Alternate implementations of don't really exist, because they're always having to play catch-up. Python's specifications level the field a bit.
Python is much more successful (it really ate Perl's lunch), and less of a moving target, because of this. Alternate implementations of don't really exist, because they're always having to play catch-up. Python's specifications level the field a bit.