diff --git a/src/cursor_ext.rs b/src/cursor_ext.rs
index ac05de1..96fc31d 100644
--- a/src/cursor_ext.rs
+++ b/src/cursor_ext.rs
@@ -71,14 +71,8 @@ impl<R: Read + Seek> ReadExt for R {
     {
         let value = self.read_i8()?;
         let result = T::try_from(value).map_err(|_| {
-            DeserializeError::InvalidEnumValue(
-                format!(
-                    "No discriminant in enum `{}` matches the value `{}`",
-                    std::any::type_name::<T>(),
-                    value,
-                )
-                .into_boxed_str(),
-            )
+            let name = std::any::type_name::<T>();
+            DeserializeError::invalid_enum_value(name, value, self)
         })?;
         Ok(result)
     }
diff --git a/src/error.rs b/src/error.rs
index cab080f..1e8bd67 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,4 +1,3 @@
-use num_enum::{TryFromPrimitive, TryFromPrimitiveError};
 use std::io;
 
 use thiserror::Error;
@@ -11,48 +10,71 @@ pub enum DeserializeError {
     #[error("Invalid header: {0}")]
     InvalidHeader(String),
     /// If a value has a size that was unexpected, e.g. UInt32Property has 8 bytes size
-    #[error("Invalid value size, expected {0} got {1} at position {2}")]
+    #[error("Invalid value size, expected {0} got {1} at position {2:#x}")]
     InvalidValueSize(u64, u64, u64),
     /// If a string has invalid size
-    #[error("Invalid string size, got {0} at position {1}")]
+    #[error("Invalid string size {0} at position {1:#x}")]
     InvalidString(u32, u64),
     /// If a boolean has invalid value
-    #[error("Invalid boolean value, got {0} at position {1}")]
+    #[error("Invalid boolean value, got {0} at position {1:#x}")]
     InvalidBoolean(u32, u64),
     /// If a hint is missing.
-    #[error("Missing hint for struct {0} at path {1}, cursor position: {2}")]
+    #[error("Missing hint for struct {0} at path {1} at position {2:#x}")]
     MissingHint(String, String, u64),
     /// If an argument is missing
-    #[error("Missing argument: {0} at position {1}")]
+    #[error("Missing argument: {0} at position {1:#x}")]
     MissingArgument(String, u64),
-    /// If an EnumProperty has an invalid enum type
-    #[error("Invalid enum type {0} at position {1}")]
-    InvalidEnumType(String, u64),
     /// If a Property creation fails
-    #[error("Invalid property {0} at position {1}")]
+    #[error("Invalid property {0} at position {1:#x}")]
     InvalidProperty(String, u64),
     /// Invalid enum value
-    #[error("{0}")]
-    InvalidEnumValue(Box<str>),
-}
-
-impl<T: TryFromPrimitive> From<TryFromPrimitiveError<T>> for DeserializeError {
-    fn from(value: TryFromPrimitiveError<T>) -> Self {
-        DeserializeError::InvalidEnumValue(value.to_string().into_boxed_str())
-    }
+    #[error("No discriminant in enum `{0}` matches the value `{1}` at position {2:#x}")]
+    InvalidEnumValue(String, i8, u64),
+    /// Invalid array index header
+    #[error("Unexpected array_index value {0} at position {1:#x}")]
+    InvalidArrayIndex(u32, u64),
+    /// Invalid terminator
+    #[error("Unexpected terminator value {0} at position {1:#x}")]
+    InvalidTerminator(u8, u64),
+    /// Invalid body length
+    #[error(
+        "Invalid body length: read_body read {0:#x}, expected {1:#x} at position {3:#x}\n{2:#?}"
+    )]
+    InvalidBodyLength(u64, u32, Box<dyn std::fmt::Debug>, u64),
 }
 
 impl DeserializeError {
     /// A helper for creating `MissingArgument` errors
-    pub fn missing_argument<S: io::Seek>(argument_name: &str, stream: &mut S) -> Self {
+    #[inline]
+    pub fn missing_argument<A, S>(argument_name: A, stream: &mut S) -> Self
+    where
+        A: Into<String>,
+        S: io::Seek,
+    {
         let position = stream.stream_position().unwrap_or_default();
-        Self::MissingArgument(argument_name.to_string(), position)
+        Self::MissingArgument(argument_name.into(), position)
     }
 
     /// A helper for creating `InvalidProperty` errors
-    pub fn invalid_property<S: io::Seek>(reason: &str, stream: &mut S) -> Self {
+    #[inline]
+    pub fn invalid_property<R, S>(reason: R, stream: &mut S) -> Self
+    where
+        R: Into<String>,
+        S: io::Seek,
+    {
+        let position = stream.stream_position().unwrap_or_default();
+        Self::InvalidProperty(reason.into(), position)
+    }
+
+    /// A helper for creating `InvalidEnumValue` errors
+    #[inline]
+    pub fn invalid_enum_value<N, S>(name: N, value: i8, stream: &mut S) -> Self
+    where
+        N: Into<String>,
+        S: io::Seek,
+    {
         let position = stream.stream_position().unwrap_or_default();
-        Self::InvalidProperty(reason.to_string(), position)
+        Self::InvalidEnumValue(name.into(), value, position)
     }
 }
 
@@ -69,13 +91,20 @@ pub enum SerializeError {
 
 impl SerializeError {
     /// A helper for creating `InvalidValue` errors
-    pub fn invalid_value(msg: &str) -> Self {
-        Self::InvalidValue(msg.to_string())
+    pub fn invalid_value<M>(msg: M) -> Self
+    where
+        M: Into<String>,
+    {
+        Self::InvalidValue(msg.into())
     }
 
     /// A helper for creating `StructMissingField` errors
-    pub fn struct_missing_field(type_name: &str, missing_field: &str) -> Self {
-        Self::StructMissingField(type_name.to_string(), missing_field.to_string())
+    pub fn struct_missing_field<T, M>(type_name: T, missing_field: M) -> Self
+    where
+        T: Into<String>,
+        M: Into<String>,
+    {
+        Self::StructMissingField(type_name.into(), missing_field.into())
     }
 }
 
diff --git a/src/properties/array_property.rs b/src/properties/array_property.rs
index ac64d29..8a07eb0 100644
--- a/src/properties/array_property.rs
+++ b/src/properties/array_property.rs
@@ -237,7 +237,7 @@ impl ArrayProperty {
                     guid,
                     structs,
                 }),
-                Err(p) => Err(SerializeError::invalid_value(&format!(
+                Err(p) => Err(SerializeError::invalid_value(format!(
                     "Array property_type {} doesn't match property inside array: {:#?}",
                     property_type, p
                 )))?,
diff --git a/src/properties/mod.rs b/src/properties/mod.rs
index 4539784..1040092 100644
--- a/src/properties/mod.rs
+++ b/src/properties/mod.rs
@@ -157,32 +157,32 @@ macro_rules! impl_read_header {
         ) -> Result<Self, Error> {
             let length = reader.read_u32::<LittleEndian>()?;
             let array_index = reader.read_u32::<LittleEndian>()?;
-            assert_eq!(
-                array_index,
-                0,
-                "Expected array_index value zero @ {:#x}",
-                reader.stream_position()? - 4,
-            );
+            if array_index != 0 {
+                let position = reader.stream_position()? - 4;
+                Err($crate::error::DeserializeError::InvalidArrayIndex(array_index, position))?
+            }
             $(
                 let $var = reader.read_string()?;
             )*
-            let separator = reader.read_u8()?;
-            assert_eq!(
-                separator,
-                0,
-                "Expected separator value zero @ {:#x}",
-                reader.stream_position()? - 1,
-            );
+            let terminator = reader.read_u8()?;
+            if terminator != 0 {
+                let position = reader.stream_position()? - 1;
+                Err($crate::error::DeserializeError::InvalidTerminator(terminator, position))?
+            }
 
             let start = reader.stream_position()?;
             let result = Self::read_body(reader, options, length $(, $var)*)?;
             let end = reader.stream_position()?;
-            assert_eq!(
-                end - start,
-                length as u64,
-                "read_body did not read the expected length {:#x}",
-                length,
-            );
+            if end - start != length as u64 {
+                let reason = format!(
+                    "read_body read {:#x}, expected {:#x} at position {:#x}\n{:#?}",
+                    end - start,
+                    length,
+                    start,
+                    result,
+                );
+                Err($crate::error::DeserializeError::InvalidProperty(reason, start))?
+            }
 
             Ok(result)
         }
@@ -196,22 +196,18 @@ macro_rules! impl_read_header {
         ) -> Result<Self, Error> {
             let length = reader.read_u32::<LittleEndian>()?;
             let array_index = reader.read_u32::<LittleEndian>()?;
-            assert_eq!(
-                array_index,
-                0,
-                "Expected array_index value zero @ {:#x}",
-                reader.stream_position()? - 4,
-            );
+            if array_index != 0 {
+                let position = reader.stream_position()? - 4;
+                Err($crate::error::DeserializeError::InvalidArrayIndex(array_index, position))?
+            }
             $(
                 let $var = reader.read_string()?;
             )*
-            let separator = reader.read_u8()?;
-            assert_eq!(
-                separator,
-                0,
-                "Expected separator value zero @ {:#x}",
-                reader.stream_position()? - 1,
-            );
+            let terminator = reader.read_u8()?;
+            if terminator != 0 {
+                let position = reader.stream_position()? - 1;
+                Err($crate::error::DeserializeError::InvalidTerminator(terminator, position))?
+            }
 
             let start = reader.stream_position()?;
             let result = Self::read_body(reader, options $(, $var)*)?;
@@ -219,9 +215,10 @@ macro_rules! impl_read_header {
             assert_eq!(
                 end - start,
                 length as u64,
-                "read_body read {:#x}, expected {:#x}\n{:#?}",
+                "read_body read {:#x}, expected {:#x} at position {:#x}\n{:#?}",
                 end - start,
                 length,
+                start,
                 result,
             );
 
@@ -239,13 +236,11 @@ macro_rules! impl_read_header {
             $(
                 let $var = reader.read_string()?;
             )*
-            let separator = reader.read_u8()?;
-            assert_eq!(
-                separator,
-                0,
-                "Expected separator value zero @ {:#x}",
-                reader.stream_position()? - 1,
-            );
+            let terminator = reader.read_u8()?;
+            if terminator != 0 {
+                let position = reader.stream_position()? - 1;
+                Err($crate::error::DeserializeError::InvalidTerminator(terminator, position))?
+            }
 
             let start = reader.stream_position()?;
             let result = Self::read_body(reader, array_index $(, Some($var))*)?;
@@ -253,8 +248,11 @@ macro_rules! impl_read_header {
             assert_eq!(
                 end - start,
                 length as u64,
-                "read_body did not read the expected length {:#x}",
+                "read_body read {:#x}, expected {:#x} at position {:#x}\n{:#?}",
+                end - start,
                 length,
+                start,
+                result,
             );
 
             Ok(result)
@@ -268,17 +266,18 @@ macro_rules! impl_read_header {
         ) -> Result<Self, Error> {
             let length = reader.read_u32::<LittleEndian>()?;
             let array_index = reader.read_u32::<LittleEndian>()?;
-            assert_eq!(array_index, 0, "Expected array_index value zero @ {:#x}", reader.stream_position()? - 4);
+            if array_index != 0 {
+                let position = reader.stream_position()? - 4;
+                Err($crate::error::DeserializeError::InvalidArrayIndex(array_index, position))?
+            }
             $(
                 let $var = reader.read_string()?;
             )*
-            let separator = reader.read_u8()?;
-            assert_eq!(
-                separator,
-                0,
-                "Expected separator value zero @ {:#x}",
-                reader.stream_position()? - 1,
-            );
+            let terminator = reader.read_u8()?;
+            if terminator != 0 {
+                let position = reader.stream_position()? - 1;
+                Err($crate::error::DeserializeError::InvalidTerminator(terminator, position))?
+            }
 
             let start = reader.stream_position()?;
             let result = Self::read_body(reader $(, Some($var))*)?;
@@ -286,8 +285,11 @@ macro_rules! impl_read_header {
             assert_eq!(
                 end - start,
                 length as u64,
-                "read_body did not read the expected length {:#x}",
+                "read_body read {:#x}, expected {:#x} at position {:#x}\n{:#?}",
+                end - start,
                 length,
+                start,
+                result,
             );
 
             Ok(result)
diff --git a/tests/gvas_tests/test_cursor.rs b/tests/gvas_tests/test_cursor.rs
index d7244af..a3bec23 100644
--- a/tests/gvas_tests/test_cursor.rs
+++ b/tests/gvas_tests/test_cursor.rs
@@ -40,24 +40,18 @@ fn test_read_string() -> Result<(), Error> {
 
     // Null
     let mut cursor = Cursor::new(vec![0u8; 4]);
-    let err = cursor.read_string().expect_err("Expected err");
-    assert_eq!(err.to_string(), "Invalid string size, got 0 at position 4");
+    let string = cursor.read_string().expect_err("Expected err").to_string();
+    assert_eq!(string, "Invalid string size 0 at position 0x4");
 
     // Missing null terminator
     let mut cursor = Cursor::new(vec![1u8, 0u8, 0u8, 0u8, b't']);
-    let err = cursor.read_string().expect_err("Expected err");
-    assert_eq!(
-        err.to_string(),
-        "Invalid string terminator 116 at position 5"
-    );
+    let string = cursor.read_string().expect_err("Expected err").to_string();
+    assert_eq!(string, "Invalid string terminator 116 at position 5");
 
     // Missing null terminator, UTF-16
     let mut cursor = Cursor::new(vec![0xffu8, 0xffu8, 0xffu8, 0xffu8, b't', b'e']);
-    let err = cursor.read_string().expect_err("Expected err");
-    assert_eq!(
-        err.to_string(),
-        "Invalid string terminator 25972 at position 6"
-    );
+    let string = cursor.read_string().expect_err("Expected err").to_string();
+    assert_eq!(string, "Invalid string terminator 25972 at position 6");
 
     Ok(())
 }