[racket] ordering for hash tables?

From: Alexander D. Knauth (alexander at knauth.org)
Date: Sat Feb 21 08:03:21 EST 2015

If I have two hash tables, both with the same set of keys, but with different values for those keys, then can I count on the order being the same for both hash-tables?

I noticed this: https://github.com/plt/racket/commit/abe1233734b3a8d46f96707cc3a2517340cb28a3 saying:
make hash-table order invertible at build time
For detecting and debugging accidental dependencies on hash-table
order, it might be helpful to invert the order at the lowest level. 
Does this mean I shouldn’t count on the order being the same?  How does this work?

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