diff --git a/mie/arg.c b/mie/arg.c
index 628b6d8..c46321c 100644
--- a/mie/arg.c
+++ b/mie/arg.c
@@ -1,4 +1,22 @@
 #include <mie/arg.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct mie_arg *mie_arg_create(struct mie_type *type)
+{
+	struct mie_arg *out = malloc(sizeof *out);
+	if (!out) {
+		return NULL;
+	}
+
+	memset(out, 0x0, sizeof *out);
+
+	mie_value_init(&out->arg_base, MIE_VALUE_ARG);
+
+	out->arg_type = type;
+
+	return out;
+}
 
 static struct mie_type *get_type(struct mie_value *v)
 {
diff --git a/mie/func.c b/mie/func.c
index 0b60e53..9a8fdc4 100644
--- a/mie/func.c
+++ b/mie/func.c
@@ -1,14 +1,13 @@
 #include <blue/core/hash.h>
 #include <blue/object/string.h>
+#include <mie/arg.h>
 #include <mie/block.h>
 #include <mie/func.h>
 #include <mie/name.h>
 #include <stdlib.h>
 #include <string.h>
 
-struct mie_func *mie_func_create(
-	const char *name, enum mie_func_type type, struct mie_type *ret_type,
-	struct mie_arg **args, unsigned int nr_args)
+struct mie_func *mie_func_create(enum mie_func_type type, struct mie_type *ret_type)
 {
 	struct mie_func *out = malloc(sizeof *out);
 	if (!out) {
@@ -19,21 +18,30 @@ struct mie_func *mie_func_create(
 
 	mie_value_init(&out->f_base, MIE_VALUE_FUNC);
 
-	out->f_base.v_name.n_str = b_strdup(name);
-	out->f_base.v_name.n_base.e_hash = b_hash_string(name);
-
 	out->f_type = type;
 	out->f_ret = ret_type;
 	out->f_names = mie_name_map_create();
 
-	for (size_t i = 0; i < nr_args; i++) {
-		if (args[i]) {
-			struct mie_value *arg_value = MIE_VALUE(args[i]);
-			b_queue_push_back(&out->f_args, &arg_value->v_entry);
-		}
+	return out;
+}
+
+struct mie_value *mie_func_add_arg(
+	struct mie_func *func, struct mie_type *type, const char *name)
+{
+	struct mie_arg *arg = mie_arg_create(type);
+	if (!arg) {
+		return NULL;
 	}
 
-	return out;
+	struct mie_value *v
+		= mie_func_generate_value_name(func, MIE_VALUE(arg), name);
+	if (!v) {
+		mie_value_destroy(MIE_VALUE(arg));
+		return NULL;
+	}
+
+	b_queue_push_back(&func->f_args, &v->v_entry);
+	return v;
 }
 
 struct mie_block *mie_func_create_block(struct mie_func *func, const char *name)
diff --git a/mie/include/mie/arg.h b/mie/include/mie/arg.h
index 803484f..88a2d03 100644
--- a/mie/include/mie/arg.h
+++ b/mie/include/mie/arg.h
@@ -10,4 +10,6 @@ struct mie_arg {
 	struct mie_type *arg_type;
 };
 
+extern struct mie_arg *mie_arg_create(struct mie_type *type);
+
 #endif
diff --git a/mie/include/mie/func.h b/mie/include/mie/func.h
index 2f39ce4..4935f03 100644
--- a/mie/include/mie/func.h
+++ b/mie/include/mie/func.h
@@ -31,8 +31,9 @@ struct mie_func {
 };
 
 extern struct mie_func *mie_func_create(
-	const char *name, enum mie_func_type type, struct mie_type *ret_type,
-	struct mie_arg **args, unsigned int nr_args);
+	enum mie_func_type type, struct mie_type *ret_type);
+extern struct mie_value *mie_func_add_arg(
+	struct mie_func *func, struct mie_type *type, const char *name);
 extern struct mie_block *mie_func_create_block(
 	struct mie_func *func, const char *name);
 extern void mie_func_insert_block(
diff --git a/mie/include/mie/module.h b/mie/include/mie/module.h
index 7740faa..7e8c337 100644
--- a/mie/include/mie/module.h
+++ b/mie/include/mie/module.h
@@ -22,7 +22,8 @@ struct mie_module {
 };
 
 extern struct mie_module *mie_module_create(void);
-extern void mie_module_add_function(struct mie_module *mod, struct mie_func *func);
+extern void mie_module_add_function(
+	struct mie_module *mod, struct mie_func *func, const char *name);
 extern struct mie_data *mie_module_get_string_ptr(
 	struct mie_module *mod, const char *s);
 extern struct mie_data *mie_module_get_data(
diff --git a/mie/include/mie/type.h b/mie/include/mie/type.h
index 5207841..7f4b914 100644
--- a/mie/include/mie/type.h
+++ b/mie/include/mie/type.h
@@ -16,6 +16,7 @@ enum mie_type_id {
 	MIE_TYPE_ARRAY = 0x08u,
 	MIE_TYPE_LABEL = 0x09u,
 	MIE_TYPE_SELECTOR = 0x0Au,
+	MIE_TYPE_FUNC = 0x0Bu,
 	__MIE_TYPE_COUNT,
 };
 
diff --git a/mie/module.c b/mie/module.c
index 8a794eb..6c896aa 100644
--- a/mie/module.c
+++ b/mie/module.c
@@ -25,9 +25,16 @@ struct mie_module *mie_module_create(void)
 	return out;
 }
 
-void mie_module_add_function(struct mie_module *mod, struct mie_func *func)
+void mie_module_add_function(
+	struct mie_module *mod, struct mie_func *func, const char *name)
 {
-	b_queue_push_back(&mod->m_func, &func->f_base.v_entry);
+	struct mie_value *v
+		= mie_module_generate_value_name(mod, MIE_VALUE(func), name);
+	if (!v) {
+		return;
+	}
+
+	b_queue_push_back(&mod->m_func, &v->v_entry);
 }
 
 struct mie_data *mie_module_get_string_ptr(struct mie_module *mod, const char *s)
diff --git a/mie/name.c b/mie/name.c
index 9439808..01fa134 100644
--- a/mie/name.c
+++ b/mie/name.c
@@ -151,9 +151,16 @@ struct mie_name *mie_name_map_put(
 
 	/* that name already exists, use a suffix to make the name unique.
 	 * alternately, no hint was specified, so it's up to us to generate the name */
+	b_rope dot = B_ROPE_CHAR('.');
 	b_rope suffix = B_ROPE_UINT(0);
 	b_rope unique_name;
-	b_rope_concat(&unique_name, &base, &suffix);
+
+	if (hint) {
+		const b_rope *parts[] = {&base, &dot, &suffix};
+		b_rope_join(&unique_name, parts, sizeof parts / sizeof parts[0]);
+	} else {
+		b_rope_concat(&unique_name, &base, &suffix);
+	}
 
 	size_t i = 0;
 	if (!hint || hint[0] == '\0') {
@@ -171,9 +178,12 @@ struct mie_name *mie_name_map_put(
 
 		if (B_OK(status)) {
 			entry->n_str = b_strdup(str);
+			b_rope_destroy(&unique_name);
 			return entry;
 		}
 	}
 
+	b_rope_destroy(&unique_name);
+
 	return NULL;
 }