Documentation for Rewrite Tag does not match real behaviour.

[Stealthmate]

Current docs (v2.2) and the docs for what I'm using (v1.9.9) both specify the following when using Rewrite Tag

A key name is specified and prefixed with a $.

This appears to work as intended with keys not containing dots (.), but for keys containing a dot, it doesn't. On the other hand, omitting the $ produces the intended behaviour.

# This works
Rule              $key_without_dot ^(.*)$ $1 true
# This does not work, but should
Rule              $key.with.dot ^(.*)$ $1 true
# This works, but shouldn't?
Rule              key.with.dot ^(.*)$ $1 true