st: sort order of empty strings in Mata

[Phil Schumm <pschumm@uchicago.edu>]

In Mata, empty strings sort to the bottom rather than to the top (as  
they do in Stata):

. di (""<"a")
1

. mata: ""<"a"
  0

Is anyone aware of the reason for this (I couldn't seem to find it in  
the documentation)?


-- Phil

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