splice was designed to handle this.

splice @array, $indextoremove, 1;
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splice can be called in any of the following forms:

splice ARRAY, OFFSET, LENGTH
#removes anything from the OFFSET index through the index OFFSET+LENGT
+H-1

splice ARRAY, OFFSET, LENGTH, LIST
#same as the previous but replaces elements removed with those in LIST

splice ARRAY, OFFSET
#removes anything from the OFFSET index on
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In any of these cases, splice returns the elements it removed.