Hi Chas,

someone specifying (roughly 9223372036854775804 5) also accepts 
9223372036854775808 as a possible value. So she has to at least think a tiny 
bit about overflow. However you are right that she should not be concerned 
about the specific implementation of roughly.

So the library has several options: Since the numeric changes in this area 
are breaking changes, the library has to either a) take overflow policy into 
its contract, or b) provide a 1.3 version with +' or c) provide an overflow 
save implementation (cf. my email to Brian) if possible. Which option is 
best depends on the single case, I fancy.

Sincerely
Meikel
 

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