Parse and format Quantities #63
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The last thing remaining needing support from the v0 version of the language was the Quantity type, whereby numeric values can have uncertainty, magnitude, and units, for example
We add support in the parser for detecting quantity numericals, and appropriate code for presenting them nicely when formatting output.
It also turned out that we weren't accounting for the width of Unicode characters when printing error messages. That is fixed, along with ensuring that the caret points to the best location relative to where the problem is.