• Add MD5 hash check for Download with stream, requests only (Add checksum validation for non-chunked non-composite downloads #32)
• Add MD5 hash check for Download with stream, generic transport (i.e in _download.py)
• Add MD5 hash check for Download without stream
• Add MD5 hash check for ChunkedDownload
• Add CRC32C hash check for Download (necessary for composite objects, though will be very slow unless crcmod is used with C speedups) (feat: add configurable crc32c checksumming for downloads #135, includes warning for slow crcmod)
• Add Upload hash checks (feat: add configurable checksum support for uploads #139)

/cc @jonparrott