Beats me.  The code is jtrfcq in v0.c:149.  Comments there are mine.  It seems to try rationals & fail back to reals sometimes.

Henry Rich

On 6/24/2020 2:39 AM, 'Bo Jacoby' via Programming wrote:
    {:>{:p. _0.8 0.2 1

4r5

    {:>{:p. _4 1 5
0.8

Thanks!
Bo

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