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Brad King authored
ENH: Added "signed char" as a distinct scalar type. For historical reasons, the C++ language treats signed char as a distinct type from char. Plain-old char might not even be signed. This change will guarantee we have a signed 8-bit integer type available. Also added GetDataTypeMin/GetDataTypeMax/GetDataTypeRange static overloads to vtkDataArray that accept the type id. The non-static versions now call the static versions with the type of data in the array.
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