diff --git a/jiter-python/src/lib.rs b/jiter-python/src/lib.rs
index 160c608..ca2e0fd 100644
--- a/jiter-python/src/lib.rs
+++ b/jiter-python/src/lib.rs
@@ -1,11 +1,17 @@
 use pyo3::prelude::*;
 
-use jiter::{python_parse, map_json_error};
+use jiter::{map_json_error, python_parse};
 
 #[pyfunction(signature = (data, *, allow_inf_nan=true, cache_strings=true))]
-pub fn from_json(py: Python, data: &[u8], allow_inf_nan: bool, cache_strings: bool) -> PyResult<PyObject> {
+pub fn from_json(
+    py: Python,
+    data: &[u8],
+    allow_inf_nan: bool,
+    cache_strings: bool,
+) -> PyResult<PyObject> {
+    let cache_mode = cache_strings.into();
     let json_bytes = data;
-    python_parse(py, json_bytes, allow_inf_nan, cache_strings).map_err(|e| map_json_error(json_bytes, &e))
+    python_parse(py, json_bytes, allow_inf_nan, cache_mode).map_err(|e| map_json_error(json_bytes, &e))
 }
 
 #[pymodule]
diff --git a/src/py_string_cache.rs b/src/py_string_cache.rs
index cb8d7b4..7087b42 100644
--- a/src/py_string_cache.rs
+++ b/src/py_string_cache.rs
@@ -15,23 +15,31 @@ pub enum StringCacheMode {
     None,
 }
 
-impl TryFrom<&PyAny> for StringCacheMode {
-    type Error = PyErr;
-
-    fn try_from(mode: &PyAny) -> PyResult<Self> {
-        if let Ok(bool_mode) = mode.downcast::<PyBool>() {
-            Ok(if bool_mode.is_true() { Self::All } else { Self::None })
+impl<'py> FromPyObject<'py> for StringCacheMode {
+    fn extract(ob: &'py PyAny) -> PyResult<StringCacheMode> {
+        if let Ok(bool_mode) = ob.downcast::<PyBool>() {
+            Ok(bool_mode.is_true().into())
         } else {
-            match mode.extract()? {
+            match ob.extract()? {
                 "all" => Ok(Self::All),
                 "keys" => Ok(Self::Keys),
                 "none" => Ok(Self::None),
-                _ => Err(PyTypeError::new_err(format!("Invalid string cache mode: {}", mode))),
+                _ => Err(PyTypeError::new_err(format!("Invalid string cache mode: {}", ob))),
             }
         }
     }
 }
 
+impl From<bool> for StringCacheMode {
+    fn from(mode: bool) -> Self {
+        if mode {
+            Self::All
+        } else {
+            Self::None
+        }
+    }
+}
+
 pub trait StringMaybeCache {
     fn get_key(py: Python, json_str: &str) -> PyObject;