set x/yrange for the fit command

[Petr M. <mi...@ph...>]

A colleague reported me that limitations due to "set yrange" are in charge 
also for the "fit" command despite that this is not documented. He thought 
that "set yrange" applies for plots only and was surprised by wrong fits.

Indeed, documentation for "fit" says that x and y range limitations for the 
"fit" command must be given as "fit [xrange] [yrange]".

And "help xrange" speak about plotting only:
  The `set xrange` command sets the horizontal range that will be displayed.

Is this bug or undocumented feature? Should gnuplot or its documentation be 
fixed?

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PM