Danger of renaming an enum label?

[Evan Martin <postgresql@xxxxxxxxxxxxxxxxx>]

I'd like to rename one of the labels of an enum in PostgreSQL 9.2 This 
can easily be done by updating pg_enum, as described at 
http://tech.valgog.com/2010/08/alter-enum-in-postgresql.html but I'd 
like to understand: what is the danger of doing so? If, as the post 
says, the data only references the OID and not the name then it should 
be safe, even if the label is used, right? But in that case why is this 
not a supported operation (via ALTER TYPE)?


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