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We're seeing type errors when building formulae that use something like `xcodebuild ..., "-arch", Hardware::CPU.arch`, since `CPU.arch` is a symbol. We've been addressing these issues by calling `#to_s` on the value but there was some talk about simply expanding the type signatures to accommodate anything that will be cast to a `String`. There's maybe still an argument to be made for doing string conversion in formulae but expanding the type signatures will resolve a number of existing type errors if we simply want to rely on implicit type casting.
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