8 bit signed float possible?

Ericsson, Björn bjorn.ericsson@REDACTED
Fri Jun 16 16:43:55 CEST 2006

I'm trying to construct an eight bit signed float in binary format:
Float = 3.14.
Bin = <<Float:8/signed-float>>.
This only give badarg error. Is 8 bits too small for a float? Manual says default is 64 bits, but I cant find info on minimum.
Any clues?

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