Sorry I don't see any references in doc. I tried using array type but got 
this error 

can't render element of type <class 'sqlalchemy.sql.sqltypes.ARRAY'>

Compiler <sqlalchemy.dialects.mysql.base.MySQLTypeCompiler object at 
0x110949e90> can't render element of type <class 
'sqlalchemy.sql.sqltypes.ARRAY'>

Here is my column defintion

sqla.Column(sqla_types.ARRAY(sqla_types.String), default=[], nullable=False)

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