[reportlab-users] barcodes encoded with Code 128 not always optimally encoded

[Josh Hieronymus]

I've noticed that when I use ReportLab to create Code 128-encoded barcodes,
the barcodes are longer than they need to be. The barcode created by
Code128("A\x00"), for example, encodes two extra symbols. Looking through
code128.py, it seems that the generated barcode for this example
unnecessarily begins in subcode B, switches to subcode A to code the symbol
for "\x00", then switches back to subcode B. If the barcode started in
subcode A, it would not need to switch.
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