diff --git a/openapi3-code-generator/src/OpenAPI/Generate/Doc.hs b/openapi3-code-generator/src/OpenAPI/Generate/Doc.hs
index 994d661..f4fa3eb 100644
--- a/openapi3-code-generator/src/OpenAPI/Generate/Doc.hs
+++ b/openapi3-code-generator/src/OpenAPI/Generate/Doc.hs
@@ -209,7 +209,7 @@ addOperationsModuleHeader mainModuleName moduleName operationId =
     . importQualified "Data.Maybe"
     . importQualified "Data.Scientific"
     . importQualified "Data.Text"
-    . importQualified "Data.Text.Internal"
+    . importQualified "Data.Text as Data.Text.Internal"
     . importQualified "Data.Time.Calendar as Data.Time.Calendar.Days"
     . importQualified "Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime"
     . importQualified "Data.Vector"
@@ -255,7 +255,7 @@ addModelModuleHeader mainModuleName moduleName modelModulesToImport description
     . importQualified "Data.Maybe"
     . importQualified "Data.Scientific"
     . importQualified "Data.Text"
-    . importQualified "Data.Text.Internal"
+    . importQualified "Data.Text as Data.Text.Internal"
     . importQualified "Data.Time.Calendar as Data.Time.Calendar.Days"
     . importQualified "Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime"
     . importQualified "GHC.Base"
@@ -277,7 +277,7 @@ addSecuritySchemesModuleHeader moduleName =
     . moduleDescription "Contains all supported security schemes defined in the specification"
     . moduleDeclaration moduleName "SecuritySchemes"
     . emptyLine
-    . importQualified "Data.Text.Internal"
+    . importQualified "Data.Text as Data.Text.Internal"
     . importQualified "GHC.Base"
     . importQualified "GHC.Classes"
     . importQualified "GHC.Show"
@@ -296,7 +296,7 @@ addConfigurationModuleHeader moduleName =
     . moduleDeclaration moduleName "Configuration"
     . emptyLine
     . importQualified "Data.Text"
-    . importQualified "Data.Text.Internal"
+    . importQualified "Data.Text as Data.Text.Internal"
     . importQualified "GHC.Types "
     . importQualified (moduleName <> ".Common")
     . emptyLine
diff --git a/openapi3-code-generator/src/OpenAPI/Generate/Types/Schema.hs b/openapi3-code-generator/src/OpenAPI/Generate/Types/Schema.hs
index c798626..0f02564 100644
--- a/openapi3-code-generator/src/OpenAPI/Generate/Types/Schema.hs
+++ b/openapi3-code-generator/src/OpenAPI/Generate/Types/Schema.hs
@@ -28,7 +28,7 @@ type Schema = Referencable SchemaObject
 data SchemaObject = SchemaObject
   { schemaObjectType :: SchemaType,
     schemaObjectTitle :: Maybe Text,
-    schemaObjectMultipleOf :: Maybe Integer,
+    schemaObjectMultipleOf :: Maybe Float,
     schemaObjectMaximum :: Maybe Float,
     schemaObjectExclusiveMaximum :: Bool,
     schemaObjectMinimum :: Maybe Float,
diff --git a/specifications/z_complex_self_made_example.yml b/specifications/z_complex_self_made_example.yml
index 0206b59..4e9b4bc 100644
--- a/specifications/z_complex_self_made_example.yml
+++ b/specifications/z_complex_self_made_example.yml
@@ -235,11 +235,13 @@ components:
         int64:
           type: integer
           format: int64
+          multipleOf: 4
         number:
           type: number
         float:
           type: number
           format: float
+          multipleOf: 0.01
         double:
           type: number
           format: double
diff --git a/testing/golden-output/src/OpenAPI/Configuration.hs b/testing/golden-output/src/OpenAPI/Configuration.hs
index 2990019..5e94b10 100755
--- a/testing/golden-output/src/OpenAPI/Configuration.hs
+++ b/testing/golden-output/src/OpenAPI/Configuration.hs
@@ -6,7 +6,7 @@
 module OpenAPI.Configuration where
 
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified GHC.Types 
 import qualified OpenAPI.Common
 
diff --git a/testing/golden-output/src/OpenAPI/Operations/MultiParam.hs b/testing/golden-output/src/OpenAPI/Operations/MultiParam.hs
index f8ee7b1..c7f80ee 100755
--- a/testing/golden-output/src/OpenAPI/Operations/MultiParam.hs
+++ b/testing/golden-output/src/OpenAPI/Operations/MultiParam.hs
@@ -26,7 +26,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified Data.Vector
diff --git a/testing/golden-output/src/OpenAPI/Operations/MultiParamWithFixedEnum.hs b/testing/golden-output/src/OpenAPI/Operations/MultiParamWithFixedEnum.hs
index 356b73e..c6bf7cf 100755
--- a/testing/golden-output/src/OpenAPI/Operations/MultiParamWithFixedEnum.hs
+++ b/testing/golden-output/src/OpenAPI/Operations/MultiParamWithFixedEnum.hs
@@ -26,7 +26,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified Data.Vector
diff --git a/testing/golden-output/src/OpenAPI/Operations/NoParam.hs b/testing/golden-output/src/OpenAPI/Operations/NoParam.hs
index ce0fac7..881c449 100755
--- a/testing/golden-output/src/OpenAPI/Operations/NoParam.hs
+++ b/testing/golden-output/src/OpenAPI/Operations/NoParam.hs
@@ -26,7 +26,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified Data.Vector
diff --git a/testing/golden-output/src/OpenAPI/Operations/Patch_pets.hs b/testing/golden-output/src/OpenAPI/Operations/Patch_pets.hs
index 39cbbf0..74726ad 100755
--- a/testing/golden-output/src/OpenAPI/Operations/Patch_pets.hs
+++ b/testing/golden-output/src/OpenAPI/Operations/Patch_pets.hs
@@ -26,7 +26,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified Data.Vector
diff --git a/testing/golden-output/src/OpenAPI/Operations/ShowPetById.hs b/testing/golden-output/src/OpenAPI/Operations/ShowPetById.hs
index 59f7d14..8a08ef6 100755
--- a/testing/golden-output/src/OpenAPI/Operations/ShowPetById.hs
+++ b/testing/golden-output/src/OpenAPI/Operations/ShowPetById.hs
@@ -26,7 +26,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified Data.Vector
diff --git a/testing/golden-output/src/OpenAPI/Operations/SingleParam.hs b/testing/golden-output/src/OpenAPI/Operations/SingleParam.hs
index d926026..274b75f 100755
--- a/testing/golden-output/src/OpenAPI/Operations/SingleParam.hs
+++ b/testing/golden-output/src/OpenAPI/Operations/SingleParam.hs
@@ -26,7 +26,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified Data.Vector
diff --git a/testing/golden-output/src/OpenAPI/Operations/SingleParamWithFixedEnum.hs b/testing/golden-output/src/OpenAPI/Operations/SingleParamWithFixedEnum.hs
index ca37dd8..a8051c0 100755
--- a/testing/golden-output/src/OpenAPI/Operations/SingleParamWithFixedEnum.hs
+++ b/testing/golden-output/src/OpenAPI/Operations/SingleParamWithFixedEnum.hs
@@ -26,7 +26,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified Data.Vector
diff --git a/testing/golden-output/src/OpenAPI/SecuritySchemes.hs b/testing/golden-output/src/OpenAPI/SecuritySchemes.hs
index 17d75ae..03744b8 100755
--- a/testing/golden-output/src/OpenAPI/SecuritySchemes.hs
+++ b/testing/golden-output/src/OpenAPI/SecuritySchemes.hs
@@ -5,7 +5,7 @@
 -- | Contains all supported security schemes defined in the specification
 module OpenAPI.SecuritySchemes where
 
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified GHC.Base
 import qualified GHC.Classes
 import qualified GHC.Show
diff --git a/testing/golden-output/src/OpenAPI/TypeAlias.hs b/testing/golden-output/src/OpenAPI/TypeAlias.hs
index 365cff3..ab6bffa 100755
--- a/testing/golden-output/src/OpenAPI/TypeAlias.hs
+++ b/testing/golden-output/src/OpenAPI/TypeAlias.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/Cat.hs b/testing/golden-output/src/OpenAPI/Types/Cat.hs
index e23d06f..abd52ef 100755
--- a/testing/golden-output/src/OpenAPI/Types/Cat.hs
+++ b/testing/golden-output/src/OpenAPI/Types/Cat.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/CoverType.hs b/testing/golden-output/src/OpenAPI/Types/CoverType.hs
index b6cdccc..b02f2aa 100755
--- a/testing/golden-output/src/OpenAPI/Types/CoverType.hs
+++ b/testing/golden-output/src/OpenAPI/Types/CoverType.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/Dog.hs b/testing/golden-output/src/OpenAPI/Types/Dog.hs
index 163c4b9..d3763ce 100755
--- a/testing/golden-output/src/OpenAPI/Types/Dog.hs
+++ b/testing/golden-output/src/OpenAPI/Types/Dog.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
@@ -50,10 +50,18 @@ data Dog = Dog {
   -- | father
   , dogFather :: (GHC.Maybe.Maybe Data.Aeson.Types.Internal.Object)
   -- | float
+  -- 
+  -- Constraints:
+  -- 
+  -- * Must be a multiple of 1.0e-2
   , dogFloat :: (GHC.Maybe.Maybe GHC.Types.Float)
   -- | int32
   , dogInt32 :: (GHC.Maybe.Maybe GHC.Int.Int32)
   -- | int64
+  -- 
+  -- Constraints:
+  -- 
+  -- * Must be a multiple of 4.0
   , dogInt64 :: (GHC.Maybe.Maybe GHC.Int.Int64)
   -- | integer
   , dogInteger :: (GHC.Maybe.Maybe GHC.Types.Int)
diff --git a/testing/golden-output/src/OpenAPI/Types/Mischling.hs b/testing/golden-output/src/OpenAPI/Types/Mischling.hs
index d6decb8..4359a27 100755
--- a/testing/golden-output/src/OpenAPI/Types/Mischling.hs
+++ b/testing/golden-output/src/OpenAPI/Types/Mischling.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
@@ -62,12 +62,20 @@ data Mischling = Mischling {
   -- | first_relative
   , mischlingFirst_relative :: (GHC.Maybe.Maybe MischlingFirst_relative)
   -- | float
+  -- 
+  -- Constraints:
+  -- 
+  -- * Must be a multiple of 1.0e-2
   , mischlingFloat :: (GHC.Maybe.Maybe GHC.Types.Float)
   -- | huntssecond
   , mischlingHuntssecond :: (GHC.Maybe.Maybe GHC.Types.Bool)
   -- | int32
   , mischlingInt32 :: (GHC.Maybe.Maybe GHC.Int.Int32)
   -- | int64
+  -- 
+  -- Constraints:
+  -- 
+  -- * Must be a multiple of 4.0
   , mischlingInt64 :: (GHC.Maybe.Maybe GHC.Int.Int64)
   -- | integer
   , mischlingInteger :: (GHC.Maybe.Maybe GHC.Types.Int)
diff --git a/testing/golden-output/src/OpenAPI/Types/PetByAge.hs b/testing/golden-output/src/OpenAPI/Types/PetByAge.hs
index 5ceb8d5..91717b5 100755
--- a/testing/golden-output/src/OpenAPI/Types/PetByAge.hs
+++ b/testing/golden-output/src/OpenAPI/Types/PetByAge.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/PetByType.hs b/testing/golden-output/src/OpenAPI/Types/PetByType.hs
index a16feba..3c2cfbb 100755
--- a/testing/golden-output/src/OpenAPI/Types/PetByType.hs
+++ b/testing/golden-output/src/OpenAPI/Types/PetByType.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/Test6.hs b/testing/golden-output/src/OpenAPI/Types/Test6.hs
index c81b2b6..7d82957 100755
--- a/testing/golden-output/src/OpenAPI/Types/Test6.hs
+++ b/testing/golden-output/src/OpenAPI/Types/Test6.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/Test7.hs b/testing/golden-output/src/OpenAPI/Types/Test7.hs
index 9b80565..aa8a037 100755
--- a/testing/golden-output/src/OpenAPI/Types/Test7.hs
+++ b/testing/golden-output/src/OpenAPI/Types/Test7.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/Test8.hs b/testing/golden-output/src/OpenAPI/Types/Test8.hs
index 2460b9d..347c170 100755
--- a/testing/golden-output/src/OpenAPI/Types/Test8.hs
+++ b/testing/golden-output/src/OpenAPI/Types/Test8.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base
diff --git a/testing/golden-output/src/OpenAPI/Types/Test9.hs b/testing/golden-output/src/OpenAPI/Types/Test9.hs
index a6b4d33..026d1c0 100755
--- a/testing/golden-output/src/OpenAPI/Types/Test9.hs
+++ b/testing/golden-output/src/OpenAPI/Types/Test9.hs
@@ -22,7 +22,7 @@ import qualified Data.Functor
 import qualified Data.Maybe
 import qualified Data.Scientific
 import qualified Data.Text
-import qualified Data.Text.Internal
+import qualified Data.Text as Data.Text.Internal
 import qualified Data.Time.Calendar as Data.Time.Calendar.Days
 import qualified Data.Time.LocalTime as Data.Time.LocalTime.Internal.ZonedTime
 import qualified GHC.Base