Description:
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Using the comparison (spaceship) operator on arrays with different lengths produces unexpected results.  It seems to be returning the difference in length instead of restricting the output to -1, 0, or 1.

I am using Zend's Debian nightly build: PHP 7.0.0-dev (cli) (built: Jun 19 2015 19:09:04)

Test script:
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// Here's a direct example from the RFC, which says this
// should evaluate to 1. However, I get 3 instead:
echo [1, 2, 3] <=> [];

// Here are some other examples:
echo [1, 2, 3, 4, 5] <=> [];  // 5
echo [] <=> [1, 2, 3, 4, 5];  // -5
echo [1, 2, 3, 4, 5] <=> [1]; // 4