Different Bidirectional Character Types

[Andreas Prilop]

On 3 July 2022, Eli Zaretskii wrote:

> I thin UAX#9 clarifies it perfectly: numbers are displayed in LTR order.

This is undisputed.
I ask about the differences

  “555-2368” vs. “2368-555”

     “1=3−2” vs. “1=2−3”

“1999-12-31” vs. “31-12-1999”

The Bidirectional Algorithm is responsible for these differences. But why?
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