This template prepares for the introduction of the new classification
system, which is a full rewrite that is both more performant and more
correct in its behavior. Unfortunately, the corrections will cause problems
with old code that may be relying on certain cases, particularly where
undefined values are implicitly treated as zero.
Consequently, the legacy and new systems will exist side-by-side, able to be
toggled on as desired so people can verify that behavior is correct before
we switch it on by default. This template allows switching on the system
for an entire package (if it's placed at the toplevel), or portions of a
package, though the latter should only be used in exceptional circumstances.
See the test cases in commits to follow for more information.
Mike Gerwitz
1e620e1e96