The experimental feature was abandoned for the operators that work on both hashes and arrays (keys, values and each) because the design couldn't work properly for all array-like and hash-like things.

The same problem didn't exist for the operators that work solely on arrays (push, pop, shift, unshift and splice(?)), but the feature was also abandoned for them to avoid a lack of symmetry with keys, values and each. However, it's worth noting that it was mentioned that newly-created postderef lessened the need for these.

In reply to Re^3: Reference is experimental by ikegami
in thread Reference is experimental by Anonymous Monk

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