flo[format descriptor] flo [n]
RRRS, R3RS: express with a floating radix point. n specifies the total number of places to be displayed. n defaults to the size of a single-precision flonum. If the number is out of range, it is converted to (sci). (flo h) expresses n in floating point format heuristically for human consumption.
See also sci and number->string.
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