Standard instant patterns are case-insensitive, unnecessarily #228
Description
For some reason we lower-case single-character patterns for Instant,
which means N, G and D work as well as n, g and d.
Only the lower-case versions are documented, and every other pattern uses
case-sensitive handling, so I *think* we're okay to just kill this behaviour so
long as we note it in the release notes.
Original issue reported on code.google.com by jonathan.skeet on 20 Jul 2013 at 6:56