Writes the byte value of
v (i.e., 8 least significant bits) to the output. Prior to writing, the output should be realigned at the byte level.
Signed or unsigned data can be written. To write a signed value just pass the byte value as an argument. To write unsigned data pass the int value as an argument (it will be automatically casted, and only the 8 least significant bits will be written).
If an I/O error ocurred.
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