The `get-text-extent` method in racket/draw does not contractually guarantee 
either exact or inexact numbers, though in practice I find it produces inexact. 

This function, however, calls into the Pango text-layout system. I find that 
when I invoke Pango's text measuring directly through the FFI, it produces 
exact results.

Is this difference in behavior deliberate, or does `get-text-extent` preserve 
exactness under certain circumstances?


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