[bug #63635] [troff] support `hydefault` register or similar

[G. Branden Robinson]

Follow-up Comment #3, bug #63635 (group groff):

[comment #2 comment #2:]
> Its intended use would seem to call for making the hydefault value global. 
Can you speak to the rationale for making it environment-specific?

Sure.

A) The hyphenation mode itself is already a property of the environment.  That
is, you can have different hyphenation modes in different environments.

B) Different environments might be used for setting text in different
languages.

C) Having the hyphenation mode default also be per-environment means that you
can invoke `hy` without arguments in any given environment and it will "do the
right thing".

Does this shed light on the matter?


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