YAML writes out Ruby symbols as !ruby/sym, e.g. :name => 'John'
becomes

!ruby/sym name: John

I write out megabytes of data, so I played with replacing !ruby/sym
with a simple colon:

:name: John

-- and it gets loaded back just as the !ruby/sym version!

Is there a way to instruct YAML to dump plain colon ':' instead of "!
ruby/sym "?  Is reading back my version a guaranteed behavior?

Cheers,
Alexy