Allowing lower case for hex flonum literals is extremely confusing in the context of the rest of the permitted syntax.
Consider: > (list #b10s1 #b10l1 #b10d1 #b10e1 #b10f1) '(4.0f0 4.0 4.0 4.0 4.0f0) > (list #o10s1 #o10l1 #o10d1 #o10e1 #o10f1) '(64.0f0 64.0 64.0 64.0 64.0f0) > (list #d10s1 #d10l1 #d10d1 #d10e1 #d10f1) '(100.0f0 100.0 100.0 100.0 100.0f0) Up to here everything is gravy. But then: > (list #x10s1 #x10l1 #x10d1 #x10e1 #x10f1) '(256.0f0 256.0 4305 4321 4337) I wasted like an hour or so trying to figure out what was going on with the last 3 cases before it finally hit me that "d", "e", and "f" are, of course, valid hexadecimal digits, so can't be used for exponent markers. It would be useful, I think, to add a note to the doc: http://docs.racket-lang.org/reference/reader.html#%28part._parse-extflonum%29 "#x2e5 reads equal to 741 (because "e" is a hex digit, and 741=2*16^2+15*16^1+5*16^0)" -Will
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