Fix format/convert ops

[ig-ra]

• distinguish between arithmetical operations on numbers (add/sub/mul/divide/shift etc) and format ops (change base, decimal/hex/binary etc).
• fix handling of format ops

[ig-ra]

hey @knu , could u plz take a look?

[knu]

Looks good. Let me try this locally.

[ig-ra]

one more question - is there a need for '#' operator?
the most common conversions (e.g. hex, octal, binary and back to decimal are already handled via designated commands (h/o/b/d) and via format instead of math-format-radix). So it feels for me a bit redundant and maybe worth removing.

[knu]

Ah, # and % are currently broken, but I'd like to fix them. I added them because I thought they might be useful when playing with things like Base36-style encodings.

[ig-ra]

Ah, # and % are currently broken, but I'd like to fix them. I added them because I thought they might be useful when playing with things like Base36-style encodings.

I see. Interesting.. I suggest to open a new PR/enhancement ticket to discuss whether base-36 style encoding conversion is something that people would like to have. For me the major value of this lib is to inc/dec ops and conversion back/forth to hex/binary/dec, but if there will be a ticket/votes then we could know whether this is something that worth (re)implementing.

If you think that # and % are currently broken, then maybe it's better to comment them out for now to stabilize version or at least to add a note in the code.

[ig-ra]

Looks good. Let me try this locally.
any bugs/issues found in your check? Should I fix anything or we may merge?