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b624c50832
The yeast() method could generate the same string twice when used in
two different iframes, which can cause Safari to only send one HTTP
request (deduplication) and trigger an HTTP 400 error afterwards since
the two iframes share the same session ID.
This new method, combining 5 chars from the timestamp and 3 chars from
Math.random() should be sufficient for our use case.
Related: https://github.com/socketio/engine.io/issues/690
See also: 874484cc1e