diff --git a/src/functions.js b/src/functions.js
index 3b28e943..c90d2482 100644
--- a/src/functions.js
+++ b/src/functions.js
@@ -131,8 +131,10 @@ const functions = (() => {
                 arg = arg[0];
             }
             str = JSON.stringify(arg, function (key, val) {
-                return (typeof val !== 'undefined' && val !== null && val.toPrecision && isNumeric(val)) ? Number(val.toPrecision(15)) :
-                    (val && isFunction(val)) ? '' : val;
+                if (typeof val !== 'undefined' && val !== null && isNumeric(val)) {
+                    return val.toPrecision && !Number.isInteger(val) ? Number(val.toPrecision(15)) : val;
+                }
+                return val && isFunction(val) ? '' : val;
             }, space);
         }
         return str;
diff --git a/test/test-suite/groups/function-formatBase/case008.json b/test/test-suite/groups/function-formatBase/case008.json
new file mode 100644
index 00000000..df426729
--- /dev/null
+++ b/test/test-suite/groups/function-formatBase/case008.json
@@ -0,0 +1,6 @@
+{
+    "expr": "$formatBase(big_id)",
+    "data": { "big_id": 5890840712243076 },
+    "bindings": {},
+    "result": "5890840712243076"
+}
diff --git a/test/test-suite/groups/function-string/case030.json b/test/test-suite/groups/function-string/case030.json
new file mode 100644
index 00000000..b92413c1
--- /dev/null
+++ b/test/test-suite/groups/function-string/case030.json
@@ -0,0 +1,6 @@
+{
+    "expr": "$string(big_id)",
+    "data": { "big_id": 5890840712243076 },
+    "bindings": {},
+    "result": "5890840712243076"
+}