This issue is for discussion of Proposal [2021-001 (Add `getWindowSz` function to `Posix.TTY` structure)](https://github.com/SMLFamily/BasisLibrary/wiki/2021-001-Add-getWindowSz-function-to-Posix.TTY-structure).
This issue is for discussion of Proposal 2021-001 (Add
getWindowSzfunction toPosix.TTYstructure).