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Re: #O, an alternate view

If you don't want your input radix migrating machine-dependently, combine the
#o and #* notations: type the PDP10 fixnum <-1,,0> as #o*777777000000 where the
"*", rather than meaning "read in machine-dependent input radix", means "read
in and truncate to machine-dependent number of bits".  Implementation Note: the
reader code for #x and #b, at least, currently needs to peek at the following
char for '"'-ness, and could check for "*"-ness as well.