diff --git a/bun/prepare.js b/bun/prepare.js
index b293d43..a0c7ad9 100644
--- a/bun/prepare.js
+++ b/bun/prepare.js
@@ -1,5 +1,5 @@
-import {readFile, writeFile} from 'fs/promises'
-import {execSync} from 'child_process'
+import { readFile, writeFile } from 'fs/promises'
+import { execSync } from 'child_process'
 
 let ver = process.argv[2]
 if (!ver) {
@@ -19,7 +19,10 @@ const spagonew = spago.replace(/version: .+/, `version: '${ver}'`)
 await writeFile('./spago.yaml', spagonew)
 
 const readme = await readFile('./README.md', 'utf8')
-const readmenew = readme.replace(/packages\/purescript-postgresql\/.+?\//g, `/packages/purescript-postgresql/${ver}/`)
+const readmenew = readme.replace(
+  /packages\/purescript-postgresql\/.+?\//g,
+  `/packages/purescript-postgresql/${ver}/`,
+)
 await writeFile('./README.md', readmenew)
 
 execSync(`git add spago.yaml package.json README.md`)
diff --git a/src/Data.Postgres.Custom.Enum.purs b/src/Data.Postgres.Custom.Enum.purs
index 431a9ba..4cac0b7 100644
--- a/src/Data.Postgres.Custom.Enum.purs
+++ b/src/Data.Postgres.Custom.Enum.purs
@@ -5,35 +5,23 @@ import Prelude
 import Control.Alt ((<|>))
 import Control.Monad.Error.Class (liftMaybe)
 import Data.Array.NonEmpty.Internal (NonEmptyArray)
-import Data.Either (hush)
 import Data.Foldable (intercalate)
 import Data.Generic.Rep (class Generic)
 import Data.Generic.Rep as G
-import Data.Maybe (Maybe(..), fromJust)
+import Data.Maybe (Maybe(..))
 import Data.Newtype as Newtype
-import Data.Postgres (RepT, deserialize, serialize)
-import Data.Postgres.Custom (class CustomRep, quoted, typeName)
+import Data.Postgres (class Rep, RepT, deserialize, serialize)
+import Data.Postgres.Custom (quoted)
 import Data.Postgres.Query (Query, emptyQuery)
 import Data.Postgres.Raw (Raw)
-import Data.String as String
-import Data.String.Regex (Regex)
-import Data.String.Regex as Regex
-import Data.String.Regex.Flags as Regex.Flags
 import Data.Symbol (class IsSymbol)
 import Foreign (ForeignError(..))
-import Partial.Unsafe (unsafePartial)
 import Type.Prelude (Proxy(..), reflectSymbol)
 
-upperRe :: Regex
-upperRe = unsafePartial fromJust $ hush $ Regex.regex "[A-Z]" Regex.Flags.global
+typeName :: forall @a ty. CustomEnum a ty => String
+typeName = reflectSymbol (Proxy @ty)
 
-leadingUnderRe :: Regex
-leadingUnderRe = unsafePartial fromJust $ hush $ Regex.regex "^_" Regex.Flags.noFlags
-
-pascalToSnake :: String -> String
-pascalToSnake = String.toLower <<< Regex.replace leadingUnderRe "" <<< Regex.replace upperRe "_$1"
-
-class CustomRep a ty <= CustomEnum a ty | a -> ty where
+class (IsSymbol ty, Rep a) <= CustomEnum a ty | a -> ty where
   enumVariants :: NonEmptyArray a
   parseEnum :: String -> Maybe a
   printEnum :: a -> String
diff --git a/src/Data.Postgres.Custom.purs b/src/Data.Postgres.Custom.purs
index 06bfc7b..aae6826 100644
--- a/src/Data.Postgres.Custom.purs
+++ b/src/Data.Postgres.Custom.purs
@@ -3,27 +3,28 @@ module Data.Postgres.Custom where
 import Prelude
 
 import Control.Monad.Except (ExceptT)
+import Data.Either (hush)
 import Data.List.NonEmpty (NonEmptyList)
-import Data.Maybe (Maybe)
+import Data.Maybe (Maybe, fromJust)
 import Data.Postgres.Raw (Raw)
+import Data.String as String
+import Data.String.Regex (Regex)
+import Data.String.Regex as Regex
+import Data.String.Regex.Flags as Regex.Flags
 import Effect (Effect)
 import Foreign (ForeignError)
+import Partial.Unsafe (unsafePartial)
 import Type.Data.Symbol (reflectSymbol)
 import Type.Prelude (class IsSymbol, Proxy(..))
 
-class (IsSymbol ty) <= CustomSerialize a ty | a -> ty where
-  customPrintExpr :: a -> Maybe String
-  customSerialize :: a -> ExceptT (NonEmptyList ForeignError) Effect Raw
-
-class (IsSymbol ty) <= CustomDeserialize a ty | a -> ty where
-  customDeserialize :: Raw -> ExceptT (NonEmptyList ForeignError) Effect a
-
-class (IsSymbol ty, CustomSerialize a ty, CustomDeserialize a ty) <= CustomRep a ty | a -> ty
-
-instance (IsSymbol ty, CustomSerialize a ty, CustomDeserialize a ty) => CustomRep a ty
-
 quoted :: String -> String
 quoted s = "'" <> s <> "'"
 
-typeName :: forall @a ty. CustomRep a ty => String
-typeName = reflectSymbol (Proxy @ty)
+upperRe :: Regex
+upperRe = unsafePartial fromJust $ hush $ Regex.regex "[A-Z]" Regex.Flags.global
+
+leadingUnderRe :: Regex
+leadingUnderRe = unsafePartial fromJust $ hush $ Regex.regex "^_" Regex.Flags.noFlags
+
+pascalToSnake :: String -> String
+pascalToSnake = String.toLower <<< Regex.replace leadingUnderRe "" <<< Regex.replace upperRe "_$1"
diff --git a/src/Data.Postgres.purs b/src/Data.Postgres.purs
index 0a5b45c..89c0cab 100644
--- a/src/Data.Postgres.purs
+++ b/src/Data.Postgres.purs
@@ -12,7 +12,6 @@ import Data.DateTime (DateTime)
 import Data.List.NonEmpty (NonEmptyList)
 import Data.Maybe (Maybe(..))
 import Data.Newtype (class Newtype, unwrap, wrap)
-import Data.Postgres.Custom (class CustomDeserialize, class CustomSerialize, customDeserialize, customSerialize)
 import Data.Postgres.Range (Range, __rangeFromRecord, __rangeRawFromRaw, __rangeRawFromRecord, __rangeRawToRecord, __rangeToRecord)
 import Data.Postgres.Raw (Null(..), Raw, jsNull)
 import Data.Postgres.Raw (unsafeFromForeign, asForeign) as Raw
@@ -73,87 +72,84 @@ instance Serialize Raw where
   serialize = pure
 
 -- | `NULL`
-else instance Serialize Unit where
+instance Serialize Unit where
   serialize _ = serialize Null
 
 -- | `NULL`
-else instance Serialize Null where
+instance Serialize Null where
   serialize _ = unsafeSerializeCoerce jsNull
 
 -- | `json`, `jsonb`
-else instance WriteForeign a => Serialize (JSON a) where
+instance WriteForeign a => Serialize (JSON a) where
   serialize = serialize <<< writeJSON <<< unwrap
 
 -- | `bytea`
-else instance Serialize Buffer where
+instance Serialize Buffer where
   serialize = unsafeSerializeCoerce
 
 -- | `int2`, `int4`
-else instance Serialize Int where
+instance Serialize Int where
   serialize = unsafeSerializeCoerce
 
 -- | `int8`
-else instance Serialize BigInt where
+instance Serialize BigInt where
   serialize = serialize <<< BigInt.toString
 
 -- | `bool`
-else instance Serialize Boolean where
+instance Serialize Boolean where
   serialize = unsafeSerializeCoerce
 
 -- | `text`, `inet`, `tsquery`, `tsvector`, `uuid`, `xml`, `cidr`, `time`, `timetz`
-else instance Serialize String where
+instance Serialize String where
   serialize = unsafeSerializeCoerce
 
 -- | `float4`, `float8`
-else instance Serialize Number where
+instance Serialize Number where
   serialize = unsafeSerializeCoerce
 
 -- | `timestamp`, `timestamptz`
-else instance Serialize DateTime where
+instance Serialize DateTime where
   serialize = serialize <<< unwrap <<< DateTime.ISO.fromDateTime
 
 -- | `Just` -> `a`, `Nothing` -> `NULL`
-else instance Serialize a => Serialize (Maybe a) where
+instance Serialize a => Serialize (Maybe a) where
   serialize (Just a) = serialize a
   serialize Nothing = unsafeSerializeCoerce jsNull
 
 -- | postgres `array`
-else instance Serialize a => Serialize (Array a) where
+instance Serialize a => Serialize (Array a) where
   serialize = unsafeSerializeCoerce <=< traverse serialize
 
-else instance (Ord a, Rep a) => Serialize (Range a) where
+instance (Ord a, Rep a) => Serialize (Range a) where
   serialize =
     map (Raw.unsafeFromForeign <<< unsafeToForeign <<< __rangeRawFromRecord <<< __rangeToRecord)
       <<< traverse serialize
 
-else instance (CustomSerialize a ty) => Serialize a where
-  serialize = customSerialize
-
 instance Deserialize Raw where
   deserialize = pure
 
 -- | `NULL` (always succeeds)
-else instance Deserialize Unit where
+instance Deserialize Unit where
   deserialize _ = pure unit
 
 -- | `NULL` (fails if non-null)
-else instance Deserialize Null where
+instance Deserialize Null where
   deserialize = map (const Null) <<< F.readNullOrUndefined <<< Raw.asForeign
 
 -- | `json`, `jsonb`
-else instance ReadForeign a => Deserialize (JSON a) where
+instance ReadForeign a => Deserialize (JSON a) where
   deserialize = map wrap <<< (hoist (pure <<< unwrap) <<< readJSON') <=< deserialize @String
 
 -- | `bytea`
-else instance Deserialize Buffer where
+instance Deserialize Buffer where
   deserialize = (F.unsafeReadTagged "Buffer") <<< Raw.asForeign
 
 -- | `int2`, `int4`
-else instance Deserialize Int where
+instance Deserialize Int where
   deserialize = F.readInt <<< Raw.asForeign
 
 -- | `int8`
-else instance Deserialize BigInt where
+instance Deserialize BigInt where
   deserialize =
     let
       invalid s = pure $ ForeignError $ "Invalid bigint: " <> s
@@ -162,30 +158,30 @@ else instance Deserialize BigInt where
       fromString <=< deserialize @String
 
 -- | `bool`
-else instance Deserialize Boolean where
+instance Deserialize Boolean where
   deserialize = F.readBoolean <<< Raw.asForeign
 
 -- | `text`, `inet`, `tsquery`, `tsvector`, `uuid`, `xml`, `cidr`, `time`, `timetz`
-else instance Deserialize String where
+instance Deserialize String where
   deserialize = F.readString <<< Raw.asForeign
 
 -- | `float4`, `float8`
-else instance Deserialize Number where
+instance Deserialize Number where
   deserialize = F.readNumber <<< Raw.asForeign
 
 -- | `timestamp`, `timestamptz`
-else instance Deserialize DateTime where
+instance Deserialize DateTime where
   deserialize raw = do
     s :: String <- deserialize raw
     let invalid = pure $ ForeignError $ "Not a valid ISO8601 string: `" <> s <> "`"
     liftMaybe invalid $ DateTime.ISO.toDateTime $ wrap s
 
 -- | postgres `array`
-else instance Deserialize a => Deserialize (Array a) where
+instance Deserialize a => Deserialize (Array a) where
   deserialize = traverse (deserialize <<< Raw.unsafeFromForeign) <=< F.readArray <<< Raw.asForeign
 
 -- | non-NULL -> `Just`, NULL -> `Nothing`
-else instance Deserialize a => Deserialize (Maybe a) where
+instance Deserialize a => Deserialize (Maybe a) where
   deserialize raw =
     let
       nothing = const Nothing <$> deserialize @Null raw
@@ -193,8 +189,5 @@ else instance Deserialize a => Deserialize (Maybe a) where
     in
       just <|> nothing
 
-else instance (Ord a, Rep a) => Deserialize (Range a) where
+instance (Ord a, Rep a) => Deserialize (Range a) where
   deserialize = traverse deserialize <=< map (__rangeFromRecord <<< __rangeRawToRecord) <<< lift <<< __rangeRawFromRaw
-
-else instance (CustomDeserialize a ty) => Deserialize a where
-  deserialize = customDeserialize
diff --git a/test/Test.Data.Postgres.Generic.purs b/test/Test.Data.Postgres.Generic.purs
index 4347e41..6f3b657 100644
--- a/test/Test.Data.Postgres.Generic.purs
+++ b/test/Test.Data.Postgres.Generic.purs
@@ -9,8 +9,7 @@ import Data.DateTime (DateTime(..))
 import Data.Generic.Rep (class Generic)
 import Data.Maybe (Maybe(..))
 import Data.Newtype (unwrap)
-import Data.Postgres (deserialize, serialize, smash)
-import Data.Postgres.Custom (class CustomDeserialize, class CustomSerialize, customDeserialize)
+import Data.Postgres (class Deserialize, class Serialize, deserialize, serialize, smash)
 import Data.Postgres.Custom.Enum (class CustomEnum, create, enumDeserialize, enumPrintExpr, enumSerialize, genericEnumVariants, genericParseEnum, genericPrintEnum, parseEnum, printEnum)
 import Data.Show.Generic (genericShow)
 import Effect.Class (liftEffect)
@@ -25,12 +24,11 @@ derive instance Eq Enum1
 instance Show Enum1 where
   show = genericShow
 
-instance CustomSerialize Enum1 "enum_1" where
-  customPrintExpr a = enumPrintExpr a
-  customSerialize a = enumSerialize a
+instance Serialize Enum1 where
+  serialize a = enumSerialize a
 
-instance CustomDeserialize Enum1 "enum_1" where
-  customDeserialize a = enumDeserialize a
+instance Deserialize Enum1 where
+  deserialize a = enumDeserialize a
 
 instance CustomEnum Enum1 "enum_1" where
   printEnum = genericPrintEnum
@@ -44,12 +42,11 @@ derive instance Eq Enum2
 instance Show Enum2 where
   show = genericShow
 
-instance CustomSerialize Enum2 "enum_2" where
-  customPrintExpr a = enumPrintExpr a
-  customSerialize a = enumSerialize a
+instance Serialize Enum2 where
+  serialize a = enumSerialize a
 
-instance CustomDeserialize Enum2 "enum_2" where
-  customDeserialize a = enumDeserialize a
+instance Deserialize Enum2 where
+  deserialize a = enumDeserialize a
 
 instance CustomEnum Enum2 "enum_2" where
   printEnum a = genericPrintEnum a
@@ -63,12 +60,11 @@ derive instance Eq Enum5
 instance Show Enum5 where
   show = genericShow
 
-instance CustomSerialize Enum5 "enum_5" where
-  customPrintExpr a = enumPrintExpr a
-  customSerialize a = enumSerialize a
+instance Serialize Enum5 where
+  serialize a = enumSerialize a
 
-instance CustomDeserialize Enum5 "enum_5" where
-  customDeserialize a = enumDeserialize a
+instance Deserialize Enum5 where
+  deserialize a = enumDeserialize a
 
 instance CustomEnum Enum5 "enum_5" where
   printEnum a = genericPrintEnum a