[racket] Formating Printing of Real Number

Unable to locate a means to control the output formatting of
Real/Floats/what-have-you either via current formatting facilities (format
procedure etc) or via some parameter.  Is there anything available?

;; stipulate in some manner
> (asin 1.0+5.0i)
0.1938+2.3310i

vs.

> (asin 1.0+5.0i)
0.1937931365549321+2.3309746530493123i
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