Revise function hashing.

src/lib.rs

@@ -142,10 +142,10 @@ pub use fn_native::Shared;
 use fn_native::Locked;
 
 #[cfg(feature = "internals")]
-pub use utils::{calc_native_fn_hash, calc_script_fn_hash, HashableHashMap};
+pub use utils::{calc_fn_hash, calc_fn_params_hash, combine_hashes, HashableHashMap};
 
 #[cfg(not(feature = "internals"))]
-pub(crate) use utils::{calc_native_fn_hash, calc_script_fn_hash};
+pub(crate) use utils::{calc_fn_hash, calc_fn_params_hash, combine_hashes};
 
 pub use rhai_codegen::*;
 
@@ -195,8 +195,8 @@ pub use token::{get_next_token, parse_string_literal, InputStream, Token, Tokeni
 #[cfg(feature = "internals")]
 #[deprecated = "this type is volatile and may change"]
 pub use ast::{
-    ASTNode, BinaryExpr, CustomExpr, Expr, FloatWrapper, FnCallExpr, Ident, ReturnType,
-    ScriptFnDef, Stmt,
+    ASTNode, BinaryExpr, CustomExpr, Expr, FloatWrapper, FnCallExpr, FnHash, Ident, OpAssignment,
+    ReturnType, ScriptFnDef, Stmt,
 };
 
 #[cfg(feature = "internals")]