Dockerfile single/double quotes in ENTRYPOINT

entrypoints.md

Double quoted entry point value

$ cat Docketrfile
FROM fedora
ENTRYPOINT ["echo"]

$ docker run --rm echotest hello     
hello

Works as expected

Single quoted entrypoint value

$ cat Dockerfile
FROM fedora
ENTRYPOINT ['echo']

$ docker run --rm echotest hello     
hello: [echo]: command not found

Is not working :-(

From docs: "Note: The exec form is parsed as a JSON array, which means that you must use double-quotes (“) around words not single-quotes (‘)." (https://docs.docker.com/engine/reference/builder/#shell-form-entrypoint-example)