Fix issue #85: Serialized code area size is doubled.

Cause: `buildTupleDynamic()` expects the number of elements, but
CodeArea::_size is the byte-size of the byte codes, which is 2x the array
length if passed as is.
Merge pull request #87 from kennytm/issue-85-2x-codearea-size

Fix issue #85: Serialized code area size is doubled.