diff --git a/thiersort.h b/thiersort.h
index f031aae..75d8faf 100644
--- a/thiersort.h
+++ b/thiersort.h
@@ -267,7 +267,7 @@ struct tselem {
 /* Forward decl of internal code */
 static inline void thiersort8_internal(
 		struct tselem *arr,
-		uint32_t length,
+		TSU32 length,
 		void* (*malloc)(size_t size),
 		void (*free)(void *ptr),
 		const TSBOOL (*lt)(
@@ -310,7 +310,7 @@ static inline const int ts_lt_float(
  */
 static inline void thiersort8_intkey(
 		struct tselem *arr,
-		uint32_t length,
+		TSU32 length,
 		void* (*malloc)(size_t size),
 		void (*free)(void *ptr)) {
 	thiersort8_internal(
@@ -330,7 +330,7 @@ static inline void thiersort8_intkey(
  */
 static inline void thiersort8_uintkey(
 		struct tselem *arr,
-		uint32_t length,
+		TSU32 length,
 		void* (*malloc)(size_t size),
 		void (*free)(void *ptr)) {
 	thiersort8_internal(
@@ -350,7 +350,7 @@ static inline void thiersort8_uintkey(
  */
 static inline void thiersort8_floatkey(
 		struct tselem *arr,
-		uint32_t length,
+		TSU32 length,
 		void* (*malloc)(size_t size),
 		void (*free)(void *ptr)) {
 	thiersort8_internal(
@@ -364,6 +364,64 @@ static inline void thiersort8_floatkey(
 		TSTRUE);
 }
 
+/**
+ * Create [key, index] pairs from your raw input data sequence. O(n) runtime.
+ *
+ * Useful if you have an seq/arr of elements to sort and what them prepared to be
+ * properly thiersorted as key, index pairs. Then you can apply that reordering
+ * later using thiersort_apply(..). Also useful for online data stream sources.
+ *
+ * BEWARE: The returned array must be freed by you - with a corresponding free.
+ *         An alternative is to do a thiersort_apply(..) call (for the array case).
+ *
+ * @param askey The sequence that generates input. Gives the ith elem as key.
+ * @param length The length of input sequence.
+ * @param malloc The function to use for allocating the key-index array.
+ * @returns The array of keys and indices for that key to sort.
+ */
+static inline struct tselem *thiersort_prepare(
+			union tskey (askey)(TSU32 i),
+			TSU32 length,
+			void* (*malloc)(size_t size)) {
+	// TODO
+}
+
+/**
+ * Create [key, index] pairs from your raw input data array. O(n) runtime.
+ *
+ * Useful if you have an array of elements to sort and what them prepared to be
+ * properly thiersorted as key, index pairs. Then you can apply that reordering
+ * later using thiersort_apply(..).
+ *
+ * BEWARE: The returned array must be freed by you - with a corresponding free.
+ *         An alternative is to do a thiersort_apply(..) call (for the array case).
+ *
+ * @param askey The sequence that generates input. Gives the ith elem as key.
+ * @param length The length of input sequence.
+ * @param malloc The function to use for allocating the key-index array.
+ * @returns The array of keys and indices for that key to sort.
+ */
+static inline struct tselem *thiersort_prepare_array(
+			void *arr,
+			union tskey (askey)(void *elem),
+			TSU32 length,
+			TSU32 elemlen,
+			void* (*malloc)(size_t size)) {
+	// TODO
+}
+
+/**
+ * Apply the given [key,index] sort result back to an array.
+ */
+static inline void thiersort_apply(
+			struct tselem *sortres,
+			void *arr,
+			TSU32 length,
+			TSU32 elemlen,
+			void (*free)(void *ptr)) {
+	// TODO
+}
+
 /**
  * Do sign-trick based radix transform on nom-2s-complement 8 bit float!
  *
@@ -533,7 +591,7 @@ static inline void ts_quicksort_fromto(
 /** Internal code reuse (type-branches should be optimized out) */
 static inline void thiersort8_internal(
 		struct tselem *arr,
-		const uint32_t length,
+		const TSU32 length,
 		void* (*malloc)(size_t size),
 		void (*free)(void *ptr),
 		const TSBOOL (*lt)(
@@ -548,9 +606,9 @@ static inline void thiersort8_internal(
 		void *reent_data) {
 
 	/* Preparation */
-	uint32_t radics[256] = {0};
+	TSU32 radics[256] = {0};
 	/* [from, to) index: only where prefix sums change - usually nonfull */
-	uint32_t real_radics[256 * 2] = {0};
+	TSU32 real_radics[256 * 2] = {0};
 	struct tselem *arr2 = malloc((sizeof struct tselem) * length);
 
 	/* Step 1) Bucketing */