Inconsistent trailing slash between hosts
The trailing backslash issue has been fixed for Windows. However, handling for tilde as replacement for $HOME on Linux is still open as of v3.9.4. I hoped the fix for #511 would also have fixed this, but the issue is still present. Linux stream(file, 'c', 'executable') matches test -x results, so I consider it fixed. (But I disagree with apparent Unix community acceptance that "permission to execute" is the same as "when I type a filename into a prompt, something other than 'command not found' is...
INPUT FIFO appends 0A to string
Typos and friends (error and help output, documentation)
unary operator in IF or WHEN statement isn't handled correctly
b2x ignores embedded spaces
Parsing errors not trapped by system exit
Qualify for dataset beginning with ~ returns invalid name