fix a char signedness bug such that this testing code becomes able
to display the contents of databases containing UTF-8 strings
on signed char architectures:
for example on i386 and amd64, UTF-8 byt

fix a char signedness bug such that this testing code becomes able
to display the contents of databases containing UTF-8 strings
on signed char architectures:
for example on i386 and amd64, UTF-8 bytes are negative...

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