ENH: Assume TCK is open in binary mode #1142
Merged
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The current TCK code makes some conversions between text and binary when reading and writing, which should not be required: the file should be open in binary mode, as it contains binary information after the text-encoded header.
This PR addresses this by assuming the file handler is in binary mode.
As a minor change, it changes the logic on computing the data offset considering the length of the length representation (chicken-egg thing). It will always be at max +1 char to represent the length.