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These are the steps to take when another semantic data type must be added to
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it() Add a tag name representing the new semantic value type to the
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tt(enum class Tag) (section ref(TAG));
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it() Add a specialization to the tt(TagTrait) trait class (section
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ref(TAGTRAIT)) defining the added semantic value's data type, and whether or
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not the data on the parser's semantic stack should be considered (im)mutable.