Add PrecisionFloatField for adding mysql precision parameters to float fields

tests/test_precision_float_field.py

@@ -0,0 +1,31 @@
+# pylint: disable=unused-import
+# pylint: disable=redefined-outer-name
+# pylint: disable=missing-class-docstring
+# pylint: disable=too-few-public-methods
+import peewee
+
+import peewee_plus
+from .fixtures import fakedb
+
+
+# There isn't anything we can really test here since this field implements
+# a MySQL-specific syntax and we test with SQLite. This test is here just
+# to ensure that the behavior is consistent with the normal FloatField when
+# working with an unsupported database backend
+def test_compatibility(fakedb):
+    """Check that the precision float field works on sqlite"""
+
+    class TestModel(peewee.Model):
+        class Meta:
+            database = fakedb
+
+        precise = peewee_plus.PrecisionFloatField(max_digits=7, decimal_places=3)
+        imprecise = peewee.FloatField()
+
+    fakedb.create_tables([TestModel])
+
+    model = TestModel(precise=1234.567, imprecise=1234.567)
+    model.save()
+
+    model = TestModel.get()
+    assert model.precise == model.imprecise