numeric dict keys are not recognized in dso get-config

[tschwarzl]

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Unfortunately, dso does not support yet the dependency of an array of input files. E.g.

params.in.yaml

files:
   - !path input/A.tsv
   - !path input/B.tsv

dvc.yaml

   deps: 
       - ${ files }

, therefore I tried following format in a project

params.in.yaml

files:
    1: !path input/A.tsv
    2: !path input/B.tsv

dvc.yaml

   deps: 
       - ${ files.1 }
       - ${ files.2 }

dso get-config then cannot resolve the numeric key:

An error occurred when executing dso get-config: An error occurred when executing dso get-config:
                     ERROR    dvc.yaml defines parameter '1' that is not in params.yaml    

Versions

dso, version 0.13.2