fix(expr): Use a sensible sorting function for sorted()

[effigies]

Array.sort(), by default, converts numbers to unicode strings and sorts them lexically. This uses (a > b) - (a < b) to implement a standard comparison operator. Greater results in 1, equal in 0, lesser in -1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.11%. Comparing base (162faeb) to head (ee9032c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1990      +/-   ##
==========================================
+ Coverage   85.68%   87.11%   +1.43%     
==========================================
  Files          91      130      +39     
  Lines        3792     6304    +2512     
  Branches     1220     1520     +300     
==========================================
+ Hits         3249     5492    +2243     
- Misses        457      721     +264     
- Partials       86       91       +5     

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[effigies]

I added sorted([9, 81, 729, 6561]) to the expression tests upstream. This PR fixes it:

  sorted([3, 2, 1])                      1,2,3         1,2,3         pass  
  allequal(sorted([3, 2, 1]), [1, 2, 3]) true          true          pass  
  sorted([9, 81, 729, 6561])             9,81,729,6561 9,81,729,6561 pass