Avoid eval(parse(...)) internally

[MichaelChirico]

eval(parse()) in a loop calling options() many time is replaced by a single call to options() without eval(parse()).

Also tuck in a style & a tiny performance improvement to .checkTypos().

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.77%. Comparing base (a080833) to head (80f788f).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7156   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files          81       81           
  Lines       15185    15187    +2     
=======================================
+ Hits        14999    15001    +2     
  Misses        186      186           

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[github-actions]

• HEAD=onload-options-call stopped early for DT[by,verbose=TRUE] improved in #6296
• HEAD=onload-options-call slower P<0.001 for memrecycle regression fixed in #5463
  

Generated via commit 80f788f

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	2 minutes and 49 seconds
Installing different package versions	40 seconds
Running and plotting the test cases	2 minutes and 39 seconds

[MichaelChirico]

This also fixes a 10-year-old mistake in fd37731 -- c(a = 1, b=NULL) drops b, so that option has never been set in .onLoad(), where the intention was to set it to NULL.

[aitap]

Thanks! A fine way to rewrite the function. I was going to suggest regmatches, but this is simple enough.