Encoding: Reformulate to avoid unsigned int overflow

Playing with clang UBSan unsigned-integer-overflow I found just 2 warnings in KWSys.

They are not undefined behavior, but often unintentional.

A reformulation to avoid the overflow was pretty straightforward.

Also noticed and changed &v[0] idiom to v.data().

changed title from Reformulation to avoid unsigned int overflow to Encoding: Reformulate to avoid unsigned int overflow

added 4 commits

• defcc4ed...2fbdf7e5 - 3 commits from branch utils:master
• 3489e4a2 - Encoding: Reformulate to avoid unsigned int overflow

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changed the description

assigned to @brad.king

requested review from @brad.king

@seanm thanks. I updated your branch to tweak the commit message.

Do: stage

Do: merge

resolved all threads

mentioned in commit 39daa0e7

merged manually

mentioned in merge request cmake/cmake!10247 (merged)