diff --git a/src/impls/neon/deser.rs b/src/impls/neon/deser.rs
index 8bda50d8..98b4d10e 100644
--- a/src/impls/neon/deser.rs
+++ b/src/impls/neon/deser.rs
@@ -1,3 +1,5 @@
+use iex::Outcome;
+
 use crate::error::ErrorType;
 use crate::impls::neon::stage1::bit_mask;
 use crate::safer_unchecked::GetSaferUnchecked;
@@ -169,14 +171,11 @@ pub(crate) fn parse_str<'invoke, 'de>(
                 // within the unicode codepoint handling code.
                 src_i += bs_dist as usize;
                 dst_i += bs_dist as usize;
-                let (o, s) = if let Ok(r) =
+                let (o, s) =
                     handle_unicode_codepoint(unsafe { src.get_kinda_unchecked(src_i..) }, unsafe {
                         buffer.get_kinda_unchecked_mut(dst_i..)
-                    }) {
-                    r
-                } else {
-                    return Err(Deserializer::error_c(src_i, 'u', InvalidUnicodeCodepoint));
-                };
+                    })
+                    .map_err(|_| Deserializer::error_c(src_i, 'u', InvalidUnicodeCodepoint))?;
                 if o == 0 {
                     return Err(Deserializer::error_c(src_i, 'u', InvalidUnicodeCodepoint));
                 };
diff --git a/src/numberparse/approx.rs b/src/numberparse/approx.rs
index a47804ef..9ea8f1b8 100644
--- a/src/numberparse/approx.rs
+++ b/src/numberparse/approx.rs
@@ -77,6 +77,7 @@ impl<'de> Deserializer<'de> {
         clippy::cast_precision_loss,
         clippy::too_many_lines
     )]
+    #[iex::iex]
     fn parse_float(idx: usize, p: &[u8], negative: bool) -> Result<StaticNode> {
         let mut digitcount = usize::from(negative);
         let mut i: f64;
@@ -222,6 +223,7 @@ impl<'de> Deserializer<'de> {
     #[cfg(not(feature = "128bit"))]
     #[inline(never)]
     #[allow(clippy::cast_possible_wrap)]
+    #[iex::iex]
     fn parse_large_integer(idx: usize, buf: &[u8], negative: bool) -> Result<StaticNode> {
         let mut digitcount = usize::from(negative);
         let mut i: u64;
@@ -283,6 +285,7 @@ impl<'de> Deserializer<'de> {
     #[cfg(feature = "128bit")]
     #[inline(never)]
     #[allow(clippy::cast_possible_wrap)]
+    #[iex::iex]
     fn parse_large_integer(idx: usize, buf: &[u8], negative: bool) -> Result<StaticNode> {
         let mut digitcount = usize::from(negative);
         let mut i: u128;
@@ -358,6 +361,7 @@ impl<'de> Deserializer<'de> {
         clippy::cast_possible_wrap,
         clippy::too_many_lines
     )]
+    #[iex::iex]
     pub(crate) fn parse_number(idx: usize, buf: &[u8], negative: bool) -> Result<StaticNode> {
         let buf = unsafe { buf.get_kinda_unchecked(idx..) };
         let mut byte_count = usize::from(negative);
diff --git a/src/stringparse.rs b/src/stringparse.rs
index f35a9f5e..e9c3a42e 100644
--- a/src/stringparse.rs
+++ b/src/stringparse.rs
@@ -29,6 +29,7 @@ const LOW_SURROGATES: Range<u32> = 0xdc00..0xe000;
 /// write appropriate values into dest
 #[cfg_attr(not(feature = "no-inline"), inline)]
 #[allow(dead_code)]
+#[iex::iex]
 pub(crate) fn handle_unicode_codepoint(
     src_ptr: &[u8],
     dst_ptr: &mut [u8],
@@ -45,6 +46,7 @@ pub(crate) fn handle_unicode_codepoint(
 /// return true if the unicode codepoint was valid
 /// We work in little-endian then swap at write time
 #[cfg_attr(not(feature = "no-inline"), inline)]
+#[iex::iex]
 pub(crate) fn get_unicode_codepoint(mut src_ptr: &[u8]) -> Result<(u32, usize), ErrorType> {
     // hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
     // conversion isn't valid; we defer the check for this to inside the