Is it anywhere stated as policy that numbers written by a string of decimal digits will be encoded with the most significant digit first in storage order? I couldn't find it stated anywhere.
As positional notation only seems to have been invented and propagated once or twice (Babylonian and Indian inventions), it is perhaps not surprising that almost all decimal positional systems have the most significant digit on the left, and so the digits have Bidi classes EN, AN or L. The one exception is the N'ko script, and consequently its digits have the Bidi class R. (I can't guarantee that this is the reason that led to their Bidi class.) Richard.
