{WORKSPACE_ROOT}/.bzlrc location is not being honored

[IgorMinar]

creating .bzlrc in my workspace root has no effect on bzl:

$ cat .bzlrc 
common --base_dir=/tmp/bzl
serve --http_port=9999

$ bzl serve
time="2020-05-27T17:53:03-07:00" level=info msg="Ready http://127.0.0.1:8080"

note that port 8080 is still used above, now if I move the .bzlrc file to my home dir everything works:

$ mv .bzlrc ~/
$ bzl serve
time="2020-05-27T17:53:56-07:00" level=info msg="Ready http://127.0.0.1:9999"

According to https://build.bzl.io/bzl/docs/configuration-files the first scenario should have worked.