understand again. Apparently, in the conversion document, conversion number, converting numbers to and from strings. That's chapter six, section six, subsection two, sub subsection nine. It says that the following procedures read and write numbers according to their external representation as defined by R5RS. No idea what that is. It's some kind of scheme definition, I think. See the ICE9IL8N module for locale dependent number parsing. Scheme procedure number dash angle bracket string in square bracket radix close square bracket. That returns a string holding the external representation of the number n in the given radix radix. If n is inexact, a radix of 10 is used. The next next section says scheme procedure string dash angle bracket number string radix. And that returns a number of the maximally precise representation expressed by a given string. Radix must be an exact integer, either 2, 8, 10 or 16 if supplied. It boils down to that the default radix is 10, so you don't actually (43/55)
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