Japanese New Era supporting does not accept Heisei 32

[kishida naoki]

I'm trying to use the Japanese new era supporting and have found that it
does not accept Heisei 32.
There are many document that include Heisei 32 or later at present. For
example, the expiration date of my driver license is Heisei 32 March.
JDK10 can accept Heisei 32.
I think the change of the behavior make some trouble.

Additionally,  Japanese government says some system use Heisei after
5/1/2019 for a while. The JDK version that include the new era support can
not be used on such system.
https://digital.asahi.com/articles/DA3S13491490.html

There are 3 ways to support the new era.
1. H32 is not accepted and S90 is not accepted. (current new era support
behavior)
2. H32 is accepted and S90 is not accepted. (current JDK behavior)
3. H32 is accepted and S90 is accepted. (to conformity)

I prefer 2 not to change the current JDK behavior.

With taking 2 or 3, we might have a new API like
JapaneseDate.from(JapaneseEra, TemporalAccessor) to specify an era on
making JapaneseDate.

-- 
Naoki Kishdia