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

add szmul.c to msvc project

fix wrong "variant" of zero/NULL/false

add explicit casts to silence warnings

fix compilation for compilers which don't set __WORDSIZE

add check for C23 compatibility

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