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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.forth
Subject: Re: objects build up from other objects - even Forth?
Date: Wed, 11 Nov 2015 01:13:06 -0800
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franck.bensusan@gmail.com writes:
> For Floats on 64bits, I don't know. Haven't done yet. If not possible,
> I will keep reference to a external object for floats (as for 32
> bits).

The usual Lisp trick for unboxed floats is to steal a few exponent bits.
That way you don't lose any precision in the mantissa.  If the number
gets too big/small to fit in the reduced exponent range, then go to a
boxed representation.