The new call is compatible with colordiff v1.0.8 - v.1.0.15 (might be compatible with even earlier versions, but not tested), while the original one breaks down under v1.0.14 and v1.0.15. See https://github.com/daveewart/colordiff/issues/22.
Conflicts: README.md runcoms/zshenv
Zhiming Wang