alt Hacker NewsWow, what a vicious footgun. I do a lot of work related to pricing, invoicing, exchange rates etc... where decimals do matter, so this kind of stresses me out. Thanks for the heads up.
Replies
kevin_thibedeau • today at 12:32 AM
0.1 is not representable in binary floating point. The old behavior was adding magic that shouldn't be there.
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ExoticPearTree • today at 8:49 AM
> Wow, what a vicious footgun.
We do too at $dayjob, but use cents for everything and at the end of the calculation we divide by 100 to get the dollar amount.
Exchange rates are 4 decimals, so you would still not get bit by this.
You shouldn’t cast from double to decimal anyway. Just use decimal throughout.