diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
new file mode 100644
index 0000000..cf45f65
--- /dev/null
+++ b/.github/workflows/push.yml
@@ -0,0 +1,23 @@
+name: push
+
+on:
+  pull_request:
+  push:
+
+jobs:
+
+  compile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 19
+          cache: sbt
+
+      - name: Run sbt
+        run: sbt -v compile
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..21dfbf8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,246 @@
+### Emacs ###
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Org-mode
+.org-id-locations
+*_archive
+
+# flymake-mode
+*_flymake.*
+
+# eshell files
+/eshell/history
+/eshell/lastdir
+
+# elpa packages
+/elpa/
+
+# reftex files
+*.rel
+
+# AUCTeX auto folder
+/auto/
+
+# cask packages
+.cask/
+dist/
+
+# Flycheck
+flycheck_*.el
+
+# server auth directory
+/server/
+
+# projectiles files
+.projectile
+
+# directory configuration
+.dir-locals.el
+
+# network security
+/network-security.data
+
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+.idea
+*.iml
+*.ipr
+
+# CMake
+cmake-build-*/
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+
+### Linux ###
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### Metals ###
+.metals/
+.bloop/
+project/**/metals.sbt
+
+### SBT ###
+# Simple Build Tool
+# http://www.scala-sbt.org/release/docs/Getting-Started/Directories.html#configuring-version-control
+
+dist/*
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+.history
+.cache
+.lib/
+
+### Vim ###
+# Swap
+[._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.ionide
+
+# Support for Project snippet scope
+.vscode/*.code-snippets
+
+# Ignore code-workspaces
+*.code-workspace
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# scala/IDEs
+.bsp
+*.semanticdb
+
+# direnv
+.env
+.envrc.*
+
+# tellerops/teller 
+.teller.yml
+
+# LibreOffice
+.~lock*
+
+# Local analysis files
+/*.py
+/*.csv
+
+# HTTP client files
+*.private.*
+/reports/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5722a60
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+Reproducer for https://github.com/Iltotore/iron/issues/190
\ No newline at end of file
diff --git a/build.sbt b/build.sbt
new file mode 100644
index 0000000..74afa31
--- /dev/null
+++ b/build.sbt
@@ -0,0 +1,18 @@
+inThisBuild(
+  scalaVersion := "3.3.1"
+)
+
+lazy val api = Project("api", file("modules/api"))
+  .settings(
+    libraryDependencies ++= Seq(
+      "org.typelevel"               %% "cats-core"   % "2.10.0",
+      "com.softwaremill.sttp.tapir" %% "tapir-core"  % "1.8.5",
+      "com.softwaremill.sttp.tapir" %% "tapir-iron"  % "1.8.5",
+      "io.circe"                    %% "circe-core"  % "0.14.6",
+      "org.scodec"                  %% "scodec-core" % "2.2.2",
+      "org.scodec"                  %% "scodec-bits" % "1.1.38",
+      "io.github.iltotore"          %% "iron"        % "2.3.0",
+      "io.github.iltotore"          %% "iron-cats"   % "2.3.0",
+      "io.github.iltotore"          %% "iron-circe"  % "2.3.0"
+    )
+  )
diff --git a/modules/api/src/main/scala/common/circe/codecs.scala b/modules/api/src/main/scala/common/circe/codecs.scala
new file mode 100644
index 0000000..1416608
--- /dev/null
+++ b/modules/api/src/main/scala/common/circe/codecs.scala
@@ -0,0 +1,11 @@
+package common.circe
+
+import io.circe.Codec
+import io.circe.Decoder
+import io.circe.Encoder
+import sttp.model.Uri
+
+object codecs:
+  given Codec[Int]    = Codec.from(Decoder.decodeInt, Encoder.encodeInt)
+  given Codec[String] = Codec.from(Decoder.decodeString, Encoder.encodeString)
+  given Codec[Uri]    = Codec.from(Decoder[String].emap(Uri.parse), Encoder[String].contramap(_.toString))
diff --git a/modules/api/src/main/scala/common/iron/constraint/all.scala b/modules/api/src/main/scala/common/iron/constraint/all.scala
new file mode 100644
index 0000000..c747b92
--- /dev/null
+++ b/modules/api/src/main/scala/common/iron/constraint/all.scala
@@ -0,0 +1,5 @@
+package common.iron.constraint
+
+object all:
+  export scodec.*
+  export scodec.given
diff --git a/modules/api/src/main/scala/common/iron/constraint/scodec.scala b/modules/api/src/main/scala/common/iron/constraint/scodec.scala
new file mode 100644
index 0000000..d949877
--- /dev/null
+++ b/modules/api/src/main/scala/common/iron/constraint/scodec.scala
@@ -0,0 +1,20 @@
+package common.iron.constraint
+
+import _root_.scodec.bits.ByteVector
+import io.github.iltotore.iron.*
+import io.github.iltotore.iron.compileTime.*
+import io.github.iltotore.iron.constraint.all.*
+import scala.compiletime.summonInline
+
+object scodec:
+
+  type MinLengthL[V <: Long]   = Length[GreaterEqual[V]] `DescribedAs` "Should have a minimum length of " + V
+  type MaxLengthL[V <: Long]   = Length[LessEqual[V]] `DescribedAs` "Should have a maximum length of " + V
+  type FixedLengthL[V <: Long] = Length[StrictEqual[V]] `DescribedAs` "Should have an exact length of " + V
+
+  class LengthByteVector[C, Impl <: Constraint[Long, C]](using Impl) extends Constraint[ByteVector, Length[C]]:
+    override inline def test(value: ByteVector): Boolean = summonInline[Impl].test(value.length)
+    override inline def message: String                  = "Length: (" + summonInline[Impl].message + ")"
+
+  inline given lengthByteVector[C, Impl <: Constraint[Long, C]](using inline impl: Impl): LengthByteVector[C, Impl] =
+    new LengthByteVector
diff --git a/modules/api/src/main/scala/common/scodec/codecs.scala b/modules/api/src/main/scala/common/scodec/codecs.scala
new file mode 100644
index 0000000..c389032
--- /dev/null
+++ b/modules/api/src/main/scala/common/scodec/codecs.scala
@@ -0,0 +1,36 @@
+package common.scodec
+
+import cats.Show
+import common.circe.codecs.given
+import common.tapir.syntax.*
+import io.circe.Codec as CirceCodec
+import io.circe.KeyDecoder as CirceKeyDecoder
+import io.circe.KeyEncoder as CirceKeyEncoder
+import scala.language.adhocExtensions
+import scodec.bits.ByteVector
+import sttp.tapir
+import sttp.tapir.Codec.PlainCodec as TapirPlainCodec
+import sttp.tapir.Codec as TapirCodec
+import sttp.tapir.Schema as TapirSchema
+
+object codecs:
+
+  trait ByteVectorCodecs:
+    protected val decode: String => Either[String, ByteVector]
+    protected val encode: ByteVector => String
+
+    given CirceKeyDecoder[ByteVector] = decode(_).toOption
+    given CirceKeyEncoder[ByteVector] = encode(_)
+    given CirceCodec[ByteVector]      = CirceCodec[String].iemap(decode)(encode)
+    given TapirPlainCodec[ByteVector] = TapirCodec.string.iemap(decode)(encode)
+    given TapirSchema[ByteVector]     = TapirSchema.string
+    given Show[ByteVector]            = encode(_)
+
+  object ByteVectorCodecs:
+    trait Hex extends ByteVectorCodecs:
+      override final val decode: String => Either[String, ByteVector] = ByteVector.fromHexDescriptive(_)
+      override final val encode: ByteVector => String                 = _.toHex
+
+    trait Base64 extends ByteVectorCodecs:
+      override final val decode: String => Either[String, ByteVector] = ByteVector.fromBase64Descriptive(_)
+      override final val encode: ByteVector => String                 = _.toBase64
diff --git a/modules/api/src/main/scala/common/tapir/syntax.scala b/modules/api/src/main/scala/common/tapir/syntax.scala
new file mode 100644
index 0000000..2c2fef9
--- /dev/null
+++ b/modules/api/src/main/scala/common/tapir/syntax.scala
@@ -0,0 +1,11 @@
+package common.tapir
+
+import _root_.sttp.tapir.*
+import cats.syntax.all.*
+import cats.Show
+
+object syntax:
+
+  extension [L, H: Show, CF <: CodecFormat](codec: Codec[L, H, CF])
+    def iemap[HH](f: H => Either[String, HH])(g: HH => H): Codec[L, HH, CF] =
+      codec.mapDecode(s => DecodeResult.fromEitherString(s.show, f(s)))(g)
diff --git a/modules/api/src/main/scala/common/types.scala b/modules/api/src/main/scala/common/types.scala
new file mode 100644
index 0000000..8550c4e
--- /dev/null
+++ b/modules/api/src/main/scala/common/types.scala
@@ -0,0 +1,38 @@
+package common
+
+import _root_.scodec.bits
+import _root_.scodec.bits.ByteVector
+import cats.syntax.all.*
+import cats.Order
+import cats.Show
+import common.circe.codecs.given
+import common.iron.constraint.all.*
+import common.iron.constraint.all.given
+import common.scodec.codecs.ByteVectorCodecs
+import common.scodec.codecs.ByteVectorCodecs.Base64
+import common.tapir.syntax.*
+import io.circe.Codec as CirceCodec
+import io.github.iltotore.iron.*
+import io.github.iltotore.iron.constraint.all.*
+import sttp.tapir
+import sttp.tapir.codec.iron.TapirCodecIron
+import sttp.tapir.Codec.PlainCodec as TapirPlainCodec
+import sttp.tapir.Codec as TapirCodec
+import sttp.tapir.Schema as TapirSchema
+
+private type PayloadConstraints = DescribedAs[MaxLengthL[1048576L], "Payload must be 1MB max"]
+opaque type Payload             = ByteVector :| PayloadConstraints
+object Payload extends RefinedTypeOps[ByteVector, PayloadConstraints, Payload], Base64, TapirCodecIron:
+  given CirceCodec[Payload]      = summon[CirceCodec[ByteVector]].iemap(either(_))(_.value)
+  given TapirPlainCodec[Payload] = summon[TapirPlainCodec[ByteVector]].iemap(either(_))(_.value)
+  given TapirSchema[Payload]     = ironTypeSchema[ByteVector, PayloadConstraints]
+  given Show[Payload]            = summon[Show[ByteVector]].contramap(_.value)
+
+private type VersionConstraints = DescribedAs[GreaterEqual[0], "Version must be positive"]
+opaque type Version             = Int :| VersionConstraints
+object Version extends RefinedTypeOps[Int, VersionConstraints, Version], TapirCodecIron:
+  given CirceCodec[Version]      = summon[CirceCodec[Int]].iemap(either(_))(_.value)
+  given TapirPlainCodec[Version] = summon[TapirPlainCodec[Int]].iemap(either(_))(_.value)
+  given TapirSchema[Version]     = ironTypeSchema[Int, VersionConstraints]
+  given Order[Version]           = Order.fromOrdering
+  given Show[Version]            = summon[Show[Int]].contramap(_.value)
diff --git a/project/build.properties b/project/build.properties
new file mode 100644
index 0000000..e8a1e24
--- /dev/null
+++ b/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.9.7