Make Region fields private #59
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This is a follow-up to jruby#58 and will release in 2.2.
Whie benchmarking the CSV library in JRuby, one of the largest groups of allocated objects was int[] primarily for Region objects, some of which most likely only have one regionand do not need the flexibility of an array of regions. This commit splits Region into multi and single forms, so that single-region objects can be as compact as possible and not require a second (or third) object for the beg/end arrays.
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It's equivalent to begEnd.length / 2.
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This is a follow-up to #58 and will release in 2.2.