Some ASCII-safe constants as byte[] to obviate ASCII-check

[DanskerDave]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.18519% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.54%. Comparing base (0d5a278) to head (9607142).
⚠️ Report is 1011 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/org/apache/axiom/mime/MultipartBodyWriter.java	85.18%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
+ Coverage   58.52%   58.54%   +0.02%     
==========================================
  Files         515      515              
  Lines       14794    14807      +13     
  Branches     2553     2555       +2     
==========================================
+ Hits         8658     8669      +11     
- Misses       5539     5540       +1     
- Partials      597      598       +1     

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[veithen]

Is this change motivated by profiling, i.e. does it address an actual performance issue?

[DanskerDave]

Is this change motivated by profiling, i.e. does it address an actual performance issue?

Well, it will make it a tad faster, by not checking that Strings known to be pure ASCII, really are ASCII.

Having them compiled as byte[] will save a bit too.

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