import inside hints doesn't work

[mr-c]

But it does work with requirements!

minimal.cwl

#!/usr/bin/env cwl-runner

cwlVersion: v1.0
class: CommandLineTool

hints:
- $import: envvar-global.yml

inputs: []
outputs: []
baseCommand: [echo]

/home/michael/workflows/env/bin/cwltool 1.0.20161113151412
Resolved 'minimal.cwl' to 'file:///home/michael/workflows/tools/minimal.cwl'
Tool definition failed validation:
Validating hint `EnvVarRequirement`: EnvVarRequirement record could not validate field `id` because it is not recognized and strict is True, valid fields are: class, envDef
could not validate field `name` because it is not recognized and strict is True, valid fields are: class, envDef