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digitalmars.D.learn - typeid(obj) vs obj.typeinfo

Hello All !
I've found in changelog: ".typeinfo property is now deprecated (use
TypeidExpression instead)"
What was the reason for it ? Why typeid (and typeof) is not a property ?
If there was a good reason, why is there obj.sizeof instead of sizeof(obj) ?
There is even array.sort (which is confusing for me, why this is not
library function ?).
I can't understand why typeid and typeof are the only one exception from
general rule about what is a property and what is not.

Mar 31 2005