[plt-scheme] likely 3.99.0.22 -> 3.99.0.23 incompatibility: hashtables

Matthew Flatt wrote:
>  * Add `table-remove', the functional complement of `table-remove!'.
>   
This name suggests that table-remove function mutated original hash 
table and the absence of ! is not unambiguous denial of that. More 
descriptive names like copy-of-table-without could be less confusing.