Avoid using JSON.stringify([...]) in makeDepKey helper function.
Avoid using JSON.stringify([...]) in makeDepKey helper function.

Creating a throwaway array just to call JSON.stringify was much more
expensive than string concatenation. The exact format of these cache keys
is an invisible implementation detail, so I picked something that seemed
unlikely ever to be ambiguous, though we can easily change it later.

apollographql/apollo-client,apollographql/apollo-client,apollostack/apollo-client,apollostack/apollo-client,apollostack/apollo-client