add advice to set the size of a buffer initialized with existing data

add copy-on-extend feature to UCX buffer - fixes #533

add CHANGELOG entry for issue #431

merge remote changes

add CHANGELOG entry for issue #531

add copy-on-write feature to UCX buffer - fixes #531

fix out of range access in test on platforms which are actually shrinking the buffer

add shortcut to binary search when array size is one

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mercurial