On: Show HN: Numscript, a declarative language to mode...

[euroderf]

The rules listed (1,2,6,7 round down; 3,4,8,9 round up). AFAIK these are also the official Eurozone cash rules for countries that choose not to circulate 1 and 2 eurocent coins. (Altho of course, electronic transactions are exact to the penny.) So you might want to cover this use case.

[o-o- → euroderf]

So basically Math.round((x*20))/20?

[Silphendio → o-o-]

Shouldn't it be `round(x/5)*5` ?

[shiandow → Silphendio]

Depends, are you working in cents or whole euros/dollars?

[falcor84 → shiandow]

In all use-cases I encountered, working with integer cents is much cleaner than decimals