graphql / graphql-js / 1399

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Use linked-list to represent response path.

This is a performance improvement to the execution path that removes the need for creating a new array to represent the response path for each resolved field in the response. Instead this creates a single-linked-list which is naturally persistently immutable.

This exposes a breaking change: if you relied on `resolve(_, _, _, { path }) {` then you'll find `path` in this linked list format instead of an array.

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