Lunderberg opened a new pull request, #15992:
URL: https://github.com/apache/tvm/pull/15992

   Prior to this commit, the `VarBinding` and `MatchCast` had equivalent `Expr 
value` fields.  For use cases that need the bound value (e.g. collecting known 
values), this required downcasting to each subclass.  This commit moves the 
`Expr value` to the base `Binding` class, removing the need for the downcasting.
   
   No impact to either C++ or Python usage is expected.  On the C++ side, all 
use of `VarBindingNode::value` or `MatchCastNode::value` will now access 
`BindingNode::value`.  On the Python side, all dynamic access of 
`binding_obj.value` will access the new field.


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