#170 add several more buffer tests

fix cxBufferMinimumCapacity not using the allocator

do not implicitly zero freshly allocated memory

fix cxBufferMinimumCapacity implementation still using additional_bytes

fix erroneous doc for cxBufferShift

#170 first buffer tests

#171 const qualifier and nonnull attributes

(0) -300 -100 -30 -10 -7 +7 +10 +30 +100 +300 tip

mercurial