Data type in YAML schema spacing issue

When creating a column in a table in a YAML schema file, the following two scenarios produce different results:

Model:
columns:
...
some_numeric:
type: integer(3)
....
__________________________
Model:
columns:
...
some_numeric:
type: integer (3)
....

Please note the spacing in the second example before the (3) in the type definition. The first example will generate a mediumint in MySQL with a length other than 3, while the second example works as expected.