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I allow dash-case when I design languages. People always ask me if I'm concerned about zero space minus. I simply say it's not allowed.
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That's why Handlebars is dash cased. I'd be shocked if mistakes around zero space minus ended up seeming ambiguous in practice in a language like Ruby. It's the kind of thing PL people like to tut tut about but humans have no trouble with.
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Related, since comma-separated-expressions are useless, there's not reason not to allow let x = 1,000
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At least in Portuguese, commas are used to separate integral from decimal parts. Please don't make a language that requires me to think about the locale used to represent numbers. :) Use dot or comma, but not both. They are too similar.
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Curious: why isn't that already a problem for decimals? What is the "thousands separator" in locales that use `,` for the decimal separator?
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. There was actually some research done on this: http://www.cs.kent.edu/~jmaletic/papers/ICPC2010-CamelCaseUnderScoreClouds.pdf …
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