[Rd] Underscores in package names

Jim Hester j@me@@|@he@ter @end|ng |rom gm@||@com
Thu Aug 8 16:31:49 CEST 2019

Are there technical reasons that package names cannot be snake case?
This seems to be enforced by `.standard_regexps()$valid_package_name`
which currently returns


Is there any technical reason this couldn't be altered to accept `_`
as well, e.g.


I realize that historically `_` has not always been valid in variable
names, but this has now been acceptable for 15+ years (since R 1.9.0 I
believe). Might we also allow underscores for package names?


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