Context

When using a tagged source like shown below, mapproxy raises a warning message on startup, which i think happens because of inconsistent type checking:

2024-08-27 09:40:27,757 - WARNING - mapproxy.config - Supported layers for source 'testsource' are '0,1,2,3,5,6,7' but tagged source requested layers '0'

Expected Behavior

No warnings on startup

Actual Behavior

Warnings on startup

Possible Fix

Check if this line

Steps to Reproduce

configure a layer like

layers:
  - name: test
    title: test
    sources: ['testsource:0']

sources:
  testsource:
    type: wms
    req:
      url: https://example.com
      layers: 0,1,2,3,5,6,7

Startup MapProxy, you should see the warning