dbluelle/lightspark — comment on commit 59ace246ff31814aa580e7debbaa8726eb6b0324
File:  line 0
By dbluelle:

I haven't found anything specific about this issue in the documentation, but the array example in
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/operators.html#delete
indicates that the items should only be deleted from the array without changing the array length