RE: On language-dependent defaults for character-folding

[Drew Adams]

> As is described in http://userguide.icu-project.org/collation/concepts
> there are several levels of character matching:
> 
> 1. Primary Level: differences between base characters
> 
> 2. Secondary Level: Accents in the characters
> 
> 3. Tertiary Level: Upper and lower case differences in characters
> 
> 4. Quaternary Level: Punctuation is ignored (where e.g. snake-cased
>    “black_bird” matches camel-cased “blackBird”)
> 
> 5. Identical Level
> 
> Maybe our customization could provide options to choose
> between all these levels?

+1

And not just options but also toggle commands. 

Thanks for guiding us to consider such groups (in addition to
other groupings that have been mentioned).