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Using the keyword let to declare constants is not a general convention. The keyword let is used that way in Swift, Rust and Haskell, but in Javascript it denotes a regular variable (just one with a special scope).
As for where the use of let to declare variables come from, it's a very old tradition for mathematical proofs:
(Source, due to popular demand: ...
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the language considers String from "string 1.0" a different type from String from "string 1.1"
Well, you found a major flow in the language you're designing.
Types should be identified by their namespace. As soon as the namespace is kept unchanged between versions, a consumer would use string.String independently if the type is actually ...
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