description.contains:start matches all kinds of tasks, requires quoting

[smemsh]

taskwarrior 2.6.2 looks at start and thinks it has more meaning than just the text to search for:

 $ task rc.verbose=on description.has:start export \
   | jq -r '.[].description' \
   | wc -l
Configuration override rc.verbose=on
Filter: ( description ~ start )
430

 $ task rc.verbose=on description.has:start export \
   | jq -r '.[].description' \
   | grep -c start
Configuration override rc.verbose=on
Filter: ( description ~ start )
11

I figured out that I can use description.contains:"start" (with the quotes escaped through to task), and it works correctly, but these quotes should not be needed. It should already be obvious to the parser that because it's an argument to <field>.<operator>: the RHS of : should not be parsed for any special meaning beyond the text itself.