v1.4.0

Initial 1.4.0 release of z4j-fastapi -- the consolidated baseline
that restarts the package's history at this version. See the
umbrella z4j 1.4.0 notes for the cross-package context:
https://github.com/z4jdev/z4j/releases/tag/v1.4.0

Install: pip install z4j-fastapi==1.4.0

Floors: >=1.4.0,<2 for every cross-z4j dependency.