spork/path relpath for windows exploration

gistfile1.txt

$ janet
Janet 1.35.2-771956b5 linux/x64/gcc - '(doc)' for help

repl:1:> (import spork/path)
@{_ @{:value <cycle 0>} path/abspath @{:private true} path/abspath? @{:private true} path/basename @{:private true} path/delim @{:private true} path/dirname @{:private true} path/ext @{:private true} path/join @{:private true} path/normalize @{:private true} path/parts @{:private true} path/posix/abspath @{:private true} path/posix/abspath? @{:private true} path/posix/basename @{:private true} path/posix/delim @{:private true} path/posix/dirname @{:private true} path/posix/ext @{:private true} path/posix/join @{:private true} path/posix/normalize @{:private true} path/posix/parts @{:private true} path/posix/relpath @{:private true} path/posix/sep @{:private true} path/relpath @{:private true} path/sep @{:private true} path/win32/abspath @{:private true} path/win32/abspath? @{:private true} path/win32/basename @{:private true} path/win32/delim @{:private true} path/win32/dirname @{:private true} path/win32/ext @{:private true} path/win32/join @{:private true} ...}

repl:2:> (path/win32/relpath `C:\WINDOWS\SYSTEM32\` `C:\`)
"..\\..\\..\\"

repl:3:> (path/posix/relpath "/usr/local/lib/janet" "/usr/local/include")
"../../include"

repl:4:> (path/posix/relpath "/usr/local/lib/janet/" "/usr/local/include")
"../../../include"