Fix non-portable code#921
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A plain `char` may be `signed` or `unsigned` depending on the implementation. Also, bitwise ORing of `signed` values is not guaranteed to be `signed`. To ensure portability, should logical-OR each comparison, but casting to `signed char` is usually sufficient.
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A plain
charmay besignedorunsigneddepending on the implementation. Also, bitwise ORing ofsignedvalues is not guaranteed to besigned. To ensure portability, should logical-OR each comparison, but casting tosigned charis usually sufficient.