CREATE TABLE fails if there is a column called "default" with Cassandra 3.11.2

My project is upgrading from Cassandra 2.1 to 3.11. We have a table whose column name is "default". The Cassandra 3.11.2 is rejecting it. I don't see "default" as a keyword in the CQL spec. 

To reproduce, try adding the following:

CREATE TABLE simple (
    simplekey text PRIMARY KEY,
    default text // THIS IS REJECTED
);

I get this error:

SyntaxException: line 3:4 mismatched input 'default' expecting ')' (...    simplekey text PRIMARY KEY,    [default]...)