Gforth Manual
5.6.2 Floating point stack
Whilst every sane Forth has a separate floating-point stack, it is not
strictly required; an ANS Forth system could theoretically keep
floating-point numbers on the data stack. As an additional difficulty,
you don't know how many cells a floating-point number takes. It is
reportedly possible to write words in a way that they work also for a
unified stack model, but we do not recommend trying it. Instead, just
say that your program has an environmental dependency on a separate
floating-point stack.
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