fix: decoder slicing size byte overflow

[muktihari]

n := b[4]
b = d.bytesArray[:n*3] // 3 byte per field

When n is 123 expected value of n*3 is 369, but since n is a byte with max value is 255, it overflows, the result is 113. This cause unexpected behaviour and even panic when trying to access the slice's index more than the available len, since the size does not match the correct size.

Since the maximum of bytesArray is 766, an uint16 should be sufficient for this task.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (88a8072) 100.00% compared to head (e947633) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #77   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         3090      3098    +8     
=========================================
+ Hits          3090      3098    +8     

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