Return length of 1 for continuation bytes#705
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A continuation byte is always at least one byte long; returning a length of two makes accidental out of bound reads more likely. Fixes haskell#704
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A continuation byte is always at least one byte long; returning a length of two makes accidental out of bound reads more likely. This reverts a change in behaviour in 2.1.3+ due to 1373ce3
Fixes #704