supplemental timedata "preferred" doesn't match "allowed" priority order.

[shawn]

There are a lot of entries in the timedata that aren't consistent.

For example:

<hours preferred="H" allowed="hB H" regions="CD"/>
<hours preferred="H" allowed="hB hb h H" regions="KE MM TZ UG"/>

​http://www.unicode.org/reports/tr35/tr35-dates.html#Time_Data

TR35 says "There is a single preferred value, and multiple allowed values." and "The allowed values are in preference order"

So, the first allowed value in preference order should also reasonably be the preferred value. I suppose that if one of the "b" values is preferred and the preferred value wants to filter those out, then it could vary, but still one would expect 12/24 hour consistency.

The above examples seem inconsistent to me. These regions apparently prefer the 24 hour clock, however they also prefer a 12 hour clock with pay period (6 at night).

[mark]

Update the spec that the preferred is for compatibility limited to h, H, k, K.
Write a test to verify that the h, H are in the right format.