Description:
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The documentation states:

"When this function results in the autoload stack being activated an existing 
__autoload function will not be reactivated."

Shouldn't this read:

"When this function results in the autoload stack being DEACTIVATED, an existing 
__autoload function will not be reactivated."

I don't think spl_autoload_unregister can result in the stack becoming activated.

Test script:
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N/A

Expected result:
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N/A

Actual result:
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N/A