Ersatz (sym? -.1) differs from pil32

[Jon Kleiser]

Hi,

There seems to be a tiny difference between Ersatz and ordinary PicoLisp in the 
“sym?” function.

In Ersatz (17.1.25 JVM) I get this:

: (mapcar sym? '(+.1 -.1))
-> (T NIL)

In 32-bit PicoLisp (16.12.8 C) I get this:

: (mapcar sym? '(+.1 -.1))
-> (T T)

I have not tested this in 64-bit PicoLisp. Sorry. ;-)

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