Collection.toArray(new T[0]) will be faster than Collection.toArray(new T[size])

Collection.toArray(new T[0]) will be faster than Collection.toArray(new T[size])

Vectorized arraycopy in the Object[] toArray() case is much faster than the type-checked arraycopy in toArray(new T[size]) and toArray(new T[0]). Alas, that does not help us if we want to get T[].

toArray(new T[0]) seems faster, safer, and contractually cleaner, and therefore should be the default choice now

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