diff --git a/src/base/type_system/README.md b/src/base/type_system/README.md
index 587291c..356cd5d 100644
--- a/src/base/type_system/README.md
+++ b/src/base/type_system/README.md
@@ -25,6 +25,8 @@ Every registered type should have it's own descriptor (`ktDescriptor`). It's a s
 ## type registration
 
 To finally register a type, you should call macro `kt_register()` between `ktDescriptors_beginInit()` and `ktDescriptors_endInit()`. Better do it at the start of your program. To register all types from kerep, call `ktDescriptors_initKerepTypes()`.  
+
+You can free internal ktDescriptors storage by calling `ktDescriptors_free()` at exit, if your debugger (valgrind in my case) sees a memory leak.  
 Examples:  
 + [ktDescriptors_initKerepTypes()](src/base/type_system/init.c)
 + [kerep types registration](tests/main.cpp)
diff --git a/src/base/type_system/base_toString.c b/src/base/type_system/base_toString.c
index ee6d5d6..a4be0ca 100644
--- a/src/base/type_system/base_toString.c
+++ b/src/base/type_system/base_toString.c
@@ -2,6 +2,26 @@
 #include "../cptr.h"
 #include "../../kprint/kprint_format.h"
 
+char* __toString_char(void* c, uint32 fmt) {
+    char* cc=malloc(2); 
+    cc[0]=*(char*)c;
+    cc[1]=0;
+    return cc;
+}
+
+char* __toString_bool(void* c, uint32 fmt) {
+    static const char _strbool[4][6]={ "false", "true\0", "False", "True\0" };
+    uint8 strind=*(bool*)c==1 + kprint_format_uppercase(fmt)*2;
+    char* rez=malloc(6);
+    rez[0]=_strbool[strind][0];
+    rez[1]=_strbool[strind][1];
+    rez[2]=_strbool[strind][2];
+    rez[3]=_strbool[strind][3];
+    rez[4]=_strbool[strind][4];
+    rez[5]=0;
+    return rez;
+}
+
 char* toString_int(int64 n){
     int64 d=n;
     char str[32];
@@ -151,3 +171,6 @@ __toString_uint_def(64)
             return NULL;\
     }\
 }
+
+__toString_float_def(32)
+__toString_float_def(64)
diff --git a/src/base/type_system/base_toString.h b/src/base/type_system/base_toString.h
index c3831cd..a0ed7ac 100644
--- a/src/base/type_system/base_toString.h
+++ b/src/base/type_system/base_toString.h
@@ -7,16 +7,19 @@ extern "C" {
 #include "../errors.h"
 
 // functions for base types
+char* __toString_char(void* c, uint32 fmt);
+char* __toString_bool(void* c, uint32 fmt);
+
 char* toString_int(int64 n);
 char* __toString_int8(void* n, uint32 fmt);
 char* __toString_int16(void* n, uint32 fmt);
-char* __toString_uint32(void* n, uint32 fmt);
+char* __toString_int32(void* n, uint32 fmt);
 char* __toString_int64(void* n, uint32 fmt);
 
 char* toString_uint(uint64 n, bool withPostfix, bool uppercase);
 char* __toString_uint8(void* n, uint32 fmt);
 char* __toString_uint16(void* n, uint32 fmt);
-char* __toString_uuint32(void* n, uint32 fmt);
+char* __toString_uint32(void* n, uint32 fmt);
 char* __toString_uint64(void* n, uint32 fmt);
 
 char* toString_float(float64 n, bool withPostfix, bool uppercase); // very bad implimentation
diff --git a/src/base/type_system/init.c b/src/base/type_system/init.c
index 3e964dc..0f1b18b 100644
--- a/src/base/type_system/init.c
+++ b/src/base/type_system/init.c
@@ -9,31 +9,32 @@ void ktDescriptors_initKerepTypes(){
     // null
     kt_register(NULL, ktId_Null, NULL, NULL);
     // base types
-    kt_register(char,    ktId_Char,    NULL, NULL);
-    kt_register(bool,    ktId_Bool,    NULL, NULL);
-    kt_register(float32, ktId_Float32, NULL, NULL);
-    kt_register(float64, ktId_Float64, NULL, NULL);
-    kt_register(int8,    ktId_Int8,    NULL, NULL);
-    kt_register(uint8,   ktId_UInt8,   NULL, NULL);
-    kt_register(int16,   ktId_Int16,   NULL, NULL);
-    kt_register(uint16,  ktId_UInt16,  NULL, NULL);
-    kt_register(int32,   ktId_Int32,   NULL, NULL);
-    kt_register(uint32,  ktId_UInt32,  NULL, NULL);
-    kt_register(int64,   ktId_Int64,   NULL, NULL);
-    kt_register(uint64,  ktId_UInt64,  NULL, NULL);
+    kt_register(char,    ktId_Char,    NULL, __toString_char);
+    kt_register(bool,    ktId_Bool,    NULL, __toString_bool);
+    kt_register(float32, ktId_Float32, NULL, __toString_float32);
+    kt_register(float64, ktId_Float64, NULL, __toString_float64);
+    kt_register(int8,    ktId_Int8,    NULL, __toString_int8);
+    kt_register(uint8,   ktId_UInt8,   NULL, __toString_uint8);
+    kt_register(int16,   ktId_Int16,   NULL, __toString_int16);
+    kt_register(uint16,  ktId_UInt16,  NULL, __toString_uint16);
+    kt_register(int32,   ktId_Int32,   NULL, __toString_int32);
+    kt_register(uint32,  ktId_UInt32,  NULL, __toString_uint32);
+    kt_register(int64,   ktId_Int64,   NULL, __toString_int64);
+    kt_register(uint64,  ktId_UInt64,  NULL, __toString_uint64);
     // base type pointers
-    kt_register(char*,    ktId_CharPtr,    NULL, NULL);
-    kt_register(bool*,    ktId_BoolPtr,    NULL, NULL);
-    kt_register(float32*, ktId_Float32Ptr, NULL, NULL);
-    kt_register(float64*, ktId_Float64Ptr, NULL, NULL);
-    kt_register(int8*,    ktId_Int8Ptr,    NULL, NULL);
-    kt_register(uint8*,   ktId_UInt8Ptr,   NULL, NULL);
-    kt_register(int16*,   ktId_Int16Ptr,   NULL, NULL);
-    kt_register(uint16*,  ktId_UInt16Ptr,  NULL, NULL);
-    kt_register(int32*,   ktId_Int32Ptr,   NULL, NULL);
-    kt_register(uint32*,  ktId_UInt32Ptr,  NULL, NULL);
-    kt_register(int64*,   ktId_Int64Ptr,   NULL, NULL);
-    kt_register(uint64*,  ktId_UInt64Ptr,  NULL, NULL);
+    kt_register(char*,    ktId_CharPtr,    NULL, __toString_char);
+    kt_register(bool*,    ktId_BoolPtr,    NULL, __toString_bool);
+    kt_register(float32*, ktId_Float32Ptr, NULL, __toString_float32);
+    kt_register(float64*, ktId_Float64Ptr, NULL, __toString_float64);
+    kt_register(int8*,    ktId_Int8Ptr,    NULL, __toString_int8);
+    kt_register(uint8*,   ktId_UInt8Ptr,   NULL, __toString_uint8);
+    kt_register(int16*,   ktId_Int16Ptr,   NULL, __toString_int16);
+    kt_register(uint16*,  ktId_UInt16Ptr,  NULL, __toString_uint16);
+    kt_register(int32*,   ktId_Int32Ptr,   NULL, __toString_int32);
+    kt_register(uint32*,  ktId_UInt32Ptr,  NULL, __toString_uint32);
+    kt_register(int64*,   ktId_Int64Ptr,   NULL, __toString_int64);
+    kt_register(uint64*,  ktId_UInt64Ptr,  NULL, __toString_uint64);
+    
     // ktDescriptor
     kt_register(ktDescriptor,  ktId_ktDescriptor,  NULL, NULL);
     kt_register(ktDescriptor*,  ktId_ktDescriptorPtr,  NULL, NULL);
diff --git a/src/base/type_system/kt_functions.c b/src/base/type_system/kt_functions.c
index a459d2a..5d3d014 100644
--- a/src/base/type_system/kt_functions.c
+++ b/src/base/type_system/kt_functions.c
@@ -76,3 +76,7 @@ ktDescriptor ktDescriptor_get(ktId id){
     }
     return typeDescriptors[id];
 }
+
+void ktDescriptors_free(){
+    free(typeDescriptors);
+}
diff --git a/src/base/type_system/kt_functions.h b/src/base/type_system/kt_functions.h
index 7274727..cf27d3e 100644
--- a/src/base/type_system/kt_functions.h
+++ b/src/base/type_system/kt_functions.h
@@ -21,6 +21,8 @@ void ktDescriptors_endInit();
 /// @param id id of registered type
 ktDescriptor ktDescriptor_get(ktId id);
 
+// call it to free heap-allocated ktDescriptors array
+void ktDescriptors_free();
 
 ktId_declare(Null);
 
diff --git a/tests/main.cpp b/tests/main.cpp
index 0ba2387..99c7197 100644
--- a/tests/main.cpp
+++ b/tests/main.cpp
@@ -22,6 +22,7 @@ int main(){
     // optime("test_all",1,test_all());
     // test_kprint_colors();
     test_rng_algorithms();
+    ktDescriptors_free();
     printf("\e[0m\n");
     return 0;
 }