Fix calculations of whether to write updated child indexes. #814
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The new checks compare incremented values. This is done so that the sentinel value ^uint32(0), when incremented, wraps around to 0 and when compared against non-zero child indexes, the check will determine that the update to increase to child index should be performed.
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The new checks compare incremented values. This is done so that the
sentinel value ^uint32(0), when incremented, wraps around to 0 and
when compared against non-zero child indexes, the check will determine
that the update to increase to child index should be performed.
Fixes #813.