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implementations that can't represent infinities or NaNs

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.