unwrap all args to + and *

[KristofferC]

Otherwise this seems inconsistent with - and /, where both first and second argument is unwrapped and it also becomes weird that a * b calls MulWorkerBuffer with the first argument BasicSymbolicImpl and the second Num

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 5.38%. Comparing base (c736678) to head (4e21400).
⚠️ Report is 105 commits behind head on master.
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❗ There is a different number of reports uploaded between BASE (c736678) and HEAD (4e21400). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (c736678)	HEAD (4e21400)
	6	3

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #1876       +/-   ##
==========================================
- Coverage   26.12%   5.38%   -20.74%     
==========================================
  Files          56      57        +1     
  Lines        5356    5574      +218     
==========================================
- Hits         1399     300     -1099     
- Misses       3957    5274     +1317     

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