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implementations that can't represent infinities or NaNs

This page is part of the web mail archives of SRFI 77 from before July 7th, 2015. The new archives for SRFI 77 contain all messages, not just those from before July 7th, 2015.

In revising SRFI 77, we noticed that many examples
involve infinities and NaNs.  It is hard to make
these examples consistent without assuming that
infinities and NaNs actually exist.

I'd like to hear about any implementations of
Scheme that support inexact reals but cannot
represent infinities or NaNs.  I already know
about Scheme 48.  If you know of others, please
mention them.