Minor tightening of Map API for Serializer methods; the keys are now Strings rather than Serializable. This is a dev branch, remember!
Minor tightening of Map API for Serializer methods; the keys are now Strings rather than Serializable. This is a dev branch, remember!

git-svn-id: 6c0206e3b9edd104850923da33ebd73b435d374d@666976 13f79535-47bb-0310-9956-ffa450edef68

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