diff --git a/src/packages/array_basic.rs b/src/packages/array_basic.rs
index c246f1d5..5574a4f5 100644
--- a/src/packages/array_basic.rs
+++ b/src/packages/array_basic.rs
@@ -3,6 +3,7 @@
 use crate::any::{Dynamic, Variant};
 use crate::def_package;
 use crate::engine::{Array, Engine};
+use crate::fn_native::FnPtr;
 use crate::module::{FuncReturn, Module};
 use crate::parser::{ImmutableString, INT};
 
@@ -83,9 +84,9 @@ macro_rules! reg_pad {
 }
 
 def_package!(crate:BasicArrayPackage:"Basic array utilities.", lib, {
-    reg_op!(lib, "push", push, INT, bool, char, ImmutableString, Array, ());
-    reg_pad!(lib, "pad", pad, INT, bool, char, ImmutableString, Array, ());
-    reg_tri!(lib, "insert", ins, INT, bool, char, ImmutableString, Array, ());
+    reg_op!(lib, "push", push, INT, bool, char, ImmutableString, FnPtr, Array, ());
+    reg_pad!(lib, "pad", pad, INT, bool, char, ImmutableString, FnPtr, Array, ());
+    reg_tri!(lib, "insert", ins, INT, bool, char, ImmutableString, FnPtr, Array, ());
 
     lib.set_fn_2_mut("append", |x: &mut Array, y: Array| {
         x.extend(y);
diff --git a/src/packages/string_basic.rs b/src/packages/string_basic.rs
index 36f4f333..08778150 100644
--- a/src/packages/string_basic.rs
+++ b/src/packages/string_basic.rs
@@ -21,7 +21,7 @@ fn to_debug<T: Debug>(x: &mut T) -> FuncReturn<ImmutableString> {
     Ok(format!("{:?}", x).into())
 }
 fn to_string<T: Display>(x: &mut T) -> FuncReturn<ImmutableString> {
-    Ok(format!("{}", x).into())
+    Ok(x.to_string().into())
 }
 #[cfg(not(feature = "no_object"))]
 fn format_map(x: &mut Map) -> FuncReturn<ImmutableString> {
diff --git a/src/packages/string_more.rs b/src/packages/string_more.rs
index 130af8b8..149823c4 100644
--- a/src/packages/string_more.rs
+++ b/src/packages/string_more.rs
@@ -1,6 +1,7 @@
 use crate::any::Dynamic;
 use crate::def_package;
 use crate::engine::Engine;
+use crate::fn_native::FnPtr;
 use crate::module::{FuncReturn, Module};
 use crate::parser::{ImmutableString, INT};
 use crate::utils::StaticVec;
@@ -88,10 +89,10 @@ macro_rules! reg_op {
 }
 
 def_package!(crate:MoreStringPackage:"Additional string utilities, including string building.", lib, {
-    reg_op!(lib, "+", append, INT, bool, char);
+    reg_op!(lib, "+", append, INT, bool, char, FnPtr);
     lib.set_fn_2( "+", |x: ImmutableString, _: ()| Ok(x));
 
-    reg_op!(lib, "+", prepend, INT, bool, char);
+    reg_op!(lib, "+", prepend, INT, bool, char, FnPtr);
     lib.set_fn_2("+", |_: (), y: ImmutableString| Ok(y));
 
     if cfg!(not(feature = "only_i32")) && cfg!(not(feature = "only_i64")) {