String, when combined with an observer, is a powerful tool for detecting entities (players, mobs, arrows, wind charges, etc.) in redstone contraptions.
However, string can only be placed in the lower half of a block today. This means that any entity crossing the top half of a block cannot be detected with this approach.
The current hitbox for string is identical to that of a lower slab. This means that another piece of string could be added in the top half of the block without changing the hitbox for string. Furthermore, the block placement rules used for slabs could be used for string as well, making this change intuitive to players and easier to implement.
An observer facing a single piece of string in the upper half of a block would work in the same manner as it does today, except that it would allow entity detection only in the upper half of the block.
An observer facing a block containing 2 pieces of string, one lower and one upper, would be triggered if either or both pieces of string are activated. This would allow entity detection anywhere within the block.
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