"$(dothis)" construct acts as a text tool in pipe (\r removed)

at first glance, this seems inconsistent to me; comments anyone?: --v-v--C-U-T---H-E-R-E-v-v-- > 06:36:47 Sun Feb 24 /adm/bin/sys/s > WS011206 adm > uname -a;echo "$(echo X$'\r')" |od -a ; echo X$'\r'|od -a CYGWIN_NT-4.0 WS011206 1.3.9(0.51/3/2) 2002-01-21

grep and sed are Cygwin "text tools", which others?, where is the list?

grep and sed are Cygwin "text tools" ;they strip out "\r" in a binary pipe. Forgive me for oversimplifying the "text tools" concept. Which other Cygwin tools have this behavior, and where is this documented? Per my tests below, cat, tac, perl, awk, head, tail, and tee are "binary tools". thanks