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It was my first intention to have a built-in range proof in Quantified. Length, or mass by their nature can not be negative and zero Kelvin is an absolute minus. 0
However, any application may suppose minus values (say, by subtracting). So it must be an external range and validation mechanism. The library shall not provide any 'plugin' mechs, to keep UValues as simple and small as possible.
0 oops, not. Some researchers already got a minus sign for their billionths of Kelvin.
Preventing "camel" calculation jumps, i.e. when a tiny one is multiplicated with a big one and then again with a tiny one. But hopefully, JS interpreter cares about or there's a lib for this.