Rails - Sep 2010 - numeric key in yam file to be used by config file

I am using a YAML file for my app config, loading it :
----
raw_config = File.read(RAILS_ROOT + "/config/app_config.yml")
APP_CONFIG = YAML.load(raw_config)[RAILS_ENV].symbolize_keys
---
It''s running well as long as I use alpha keys

development:
    seve:
      api_token: e09cba8653489749388797926512bb75

then APP_CONFIG[:seve]["api_token"] gives me
e09cba8653489749388797926512bb75

BUT I need to use a ''numeric'' project_id key , like   123456
rather
than seve, and writing

development:
    123456:
      api_token: e09cba8653489749388797926512bb7

gives me a syntax error, unexpected tINTEGER (which I can
understand...)

how can I user a numeric key ?

thanks fyh

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