Make MappedString.apply(null) not require a type annotation
Currently MappedString still has the deprecated apply(Box[String]), which means that apply(null) is ambiguous; you have to write apply(null: String). By moving apply(Box[String]) into a supertrait and apply(String) in MappedString directly, apply(null) will work.
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(In revision:03c95bc8f5880a49ebfcba887135a0c56c86b19f) Fix #1026: Make MappedString.apply(null) not require a type annotation
Branch: master
Branch: master