BDI: neutral when nested

Test passes if the two boxes are identical.

א + [a + [ב + [b + 4] + 3] + 2] + 1
א + [a + [ב + [b + 4] + 3] + 2] + 1
א + [a + [ב + [b + 4] + 3] + 2] + 1
a + [א + [b + [ב + 3] + 2] + 1] + 0
a + [א + [b + [ב + 3] + 2] + 1] + 0
a + [א + [b + [ב + 3] + 2] + 1] + 0
‭1 + [a + [3 + [b + 4] + ב] + 2] + א‬
‭1 + [a + [3 + [b + 4] + ב] + 2] + א‬
‭1 + [a + [3 + [b + 4] + ב] + 2] + א‬
‭a + [1 + [b + [3 + ב] + 2] + א] + 0‬
‭a + [1 + [b + [3 + ב] + 2] + א] + 0‬
‭a + [1 + [b + [3 + ב] + 2] + א] + 0‬

For the purposes of applying the bidirectional algorithm to the paragraph-level container that a bdi element finds itself within, the bdi element must be treated like a U+FFFC OBJECT REPLACEMENT CHARACTER. This must apply when a BDI is nested within a BDI.

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the-dir-attribute-084
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Assumptions: