Tcl's [binary scan] and the Go Challenge 1

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In the programming language Tcl the command [binary scan] decodes binary data according to a format string. For example,

binary scan $data {cu4 f1 a*} fourBytes aFloat remainder

will read four unsigned 8-bit integers from the string data and put them into the variable fourBytes, then read one 32-bit floating point number and put it in aFloat, then, finally, put the remaining string in remainder (without altering data itself).

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