Laws for Show and Read?

[Sven Panne]

Am Mi., 5. Juni 2019 um 22:57 Uhr schrieb Bertram Felgenhauer via Libraries
<libraries at haskell.org>:

> [...] It's true that extra information in NaNs is lost, but they all behave
> the same anyway...
>

That's true for normal arithmetic with them, but wrong if you use e.g. an
external library which encodes things into the sign bit/paylod of NaNs (see
e.g. NaN tagging). In the latter case, "read . show" actively destroys
necessary information.
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