Different Bidirectional Character Types

[Andreas Prilop]

Reference:
 https://unicode.org/reports/tr9/#Bidirectional_Character_Types

Why do Hebrew letters and Arabic letters have different
bidirectional character types?

Some effects can be seen using this HTML code:

<h1>
רוקפורד  555-2368
<br>
روكفورد  555-2368
<br>
או  3−2=1
<br>
أو  3−2=1
</h1>


Why do Arabic-Indic digits (U+0660 …) and Persian digits (U+06F0 …)
have different bidirectional character types?

Some effects can be seen using this HTML code:

<h1>
&#x661;&#x669;&#x669;&#x669; &#x661;&#x662; &#x663;&#x661;
١٩٩٩-١٢-٣١
<br>
&#x6F1;&#x6F9;&#x6F9;&#x6F9; &#x6F1;&#x6F2; &#x6F3;&#x6F1;
۱۹۹۹-۱۲-۳۱
</h1>