On 7/30/19 9:11 PM, John Cowan wrote:
> Mmm, I'm not that happy with full arithmetic.

You might find the XQuery datatypes and functions interesting prior art:

https://www.w3.org/TR/xpath-functions-31
especially chapters 8 and 9.

The op:xxx functions are bound to overloadings of the standard
binary operators.  For example op:substract-dates is the underlying
function called when a program has the expression DATE1 - DATE2.

(I haven't read this discussion carefully, so I apologize
if this has been already mention - most likely by John.)
--
	--Per Bothner
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