Changes

Summary

1. merged
2. exclude file name components that are special on Windows;
3. reject further illegal chars according to https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
4. tuned;
5. more strict check: avoid confusion of Path.basic with Path.current / Path.parent;
6. tuned;
7. prefer naming convention from datatype package for strong congruence rules
8. redundant