This is from the JSON-LD spec.

@reiver ⊼ (Charles) :batman:

ActivityPub / ActivityStream are based on JSON-LD.

I think it was a very bad idea for JSON-LD to define "number" this way!

It makes it so numbers with fractional values are inexact & lossy.

This include values that are common for money.

For example, neither 0.10 and 0.20 can be represented exactly. So, 0.10 + 0.20 does NOT equal 0.30!

It should have used FIXED-point numbers rather than FLOATING-point.