Hey joda devs!,

I noticed that the hashCode of identical Periods varies across JVM
runs.  I traced this to StandardDurationFieldType, which doesn't
overload the default hashCode method.  Luckily, there is only one
instance of each distinct StandardDurationFieldType.  But if you
relaunch the JVM, the same DurationFieldType will map to different
hashCode values.

If we agree that deterministic behavior from hashCode is desirable, I
will write and submit a patch in the next day.  I'll just override
hashCode to return a hash of the "ordinal" byte specifying the
DurationFieldType.

-- Ned Ruggeri

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