[receive] use get() in has_all_pages() instead of unguarded array index #53
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Docker ipv4 tests run OK on local pc. trigger GH action tests again.
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If pages were duplicated or received out of order, it's possible that has_all_pages() could have an array lookup that causes a panic. Using get() is a safe way to check for a value and ensure the array bounds are within range.
fixes #47