runtime/wasm: Make bigIntToString return a decimal string

Author: Jannis Pohlmann

runtime/wasm/src/host_exports.rs

@@ -240,12 +240,8 @@ where
         format!("0x{}", ::hex::encode(bytes))
     }
 
-    pub(crate) fn big_int_to_string(
-        &self,
-        n: BigInt,
-    ) -> Result<String, HostExportError<impl ExportError>> {
-        let bytes = n.to_bytes_le().1;
-        self.bytes_to_string(bytes)
+    pub(crate) fn big_int_to_string(&self, n: BigInt) -> String {
+        format!("{}", n)
     }
 
     pub(crate) fn big_int_to_hex(&self, n: BigInt) -> String {

runtime/wasm/src/module/mod.rs

@@ -333,7 +333,7 @@ where
     ) -> Result<Option<RuntimeValue>, Trap> {
         let bytes: Vec<u8> = self.heap.asc_get(big_int_ptr);
         let n = BigInt::from_signed_bytes_le(&*bytes);
-        let result = self.host_exports.big_int_to_string(n)?;
+        let result = self.host_exports.big_int_to_string(n);
         Ok(Some(RuntimeValue::from(self.heap.asc_new(&result))))
     }