Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/17489
  
    I think the question is: would this cause any input that currently works to 
not work? 
    It's not a deal-breaker but that's the question. Doesn't "-1100" work right 
now? it would stop working if the default is `XXX`. According to the docs, the 
current default of `ZZ` should allow that and it seems to work.
    
    If it's a corner case we need to break in order to fix bigger problems, 
that's possible, but just trying to quantify that. That is, maybe this is also 
solvable with a doc change, to describe correctly what it currently does rather 
than change what it does?


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