diff --git a/case035.json b/case035.json
new file mode 100644
index 00000000..d2a1a5c8
--- /dev/null
+++ b/case035.json
@@ -0,0 +1,9 @@
+{
+    "expr": "λ($arg1, $arg2)<n+n:o>{{\"$arg1\": $arg1, \"$arg2\": $arg2}}(1, 2, 3)",
+    "dataset": null,
+    "bindings": {},
+    "result": {
+        "$arg1": 1,
+        "$arg2": 2
+    }
+}
\ No newline at end of file
diff --git a/case036.json b/case036.json
new file mode 100644
index 00000000..bcaca8ff
--- /dev/null
+++ b/case036.json
@@ -0,0 +1,6 @@
+{
+    "expr": "λ($arg1, $arg2, $arg3)<n+s:a<n>>{[$arg1, $arg2, $arg3]}(1, 2, \"a\")",
+    "dataset": null,
+    "bindings": {},
+    "result": [1, 2, "a"]
+}
\ No newline at end of file
diff --git a/case037.json b/case037.json
new file mode 100644
index 00000000..2ca5fb32
--- /dev/null
+++ b/case037.json
@@ -0,0 +1,6 @@
+{
+    "expr": "λ($arg1, $arg2, $arg3)<n+s-:a<n>>{[$arg1, $arg2, $arg3]}(1, 2, \"a\")",
+    "data": "b",
+    "bindings": {},
+    "result": [1, 2, "a"]
+}
\ No newline at end of file
diff --git a/case038.json b/case038.json
new file mode 100644
index 00000000..f7491da5
--- /dev/null
+++ b/case038.json
@@ -0,0 +1,6 @@
+{
+    "expr": "λ($arg1, $arg2, $arg3)<n+s-:a<n>>{[$arg1, $arg2, $arg3]}(1, 2)",
+    "data": "b",
+    "bindings": {},
+    "result": [1, 2, "b"]
+}
\ No newline at end of file
diff --git a/case039.json b/case039.json
new file mode 100644
index 00000000..d891867f
--- /dev/null
+++ b/case039.json
@@ -0,0 +1,9 @@
+{
+    "expr": "λ($arg1, $arg2)<a<n>+:o>{{'$arg1': $arg1, '$arg2': $arg2}}([1, 2], [3, 4], [5, 6])",
+    "data": "b",
+    "bindings": {},
+    "result": {
+        "$arg1": [1, 2],
+        "$arg2": [3, 4]
+    }
+}
\ No newline at end of file
diff --git a/case040.json b/case040.json
new file mode 100644
index 00000000..25199bd4
--- /dev/null
+++ b/case040.json
@@ -0,0 +1,6 @@
+{
+    "expr": "λ($arg1, $arg2)<s?n+:a<n>>{[$arg1, $arg2]}(1, 2, 3)",
+    "dataset": null,
+    "bindings": {},
+    "result": [1, 2]
+}
\ No newline at end of file
diff --git a/src/signature.js b/src/signature.js
index f0972773..d0eb4e41 100644
--- a/src/signature.js
+++ b/src/signature.js
@@ -252,15 +252,15 @@ const signature = (() => {
                                 argIndex++;
                             }
                         } else {
-                            // may have matched multiple args (if the regex ends with a '+'
+                            // may have matched multiple args (if the regex ends with a '+')
                             // split into single tokens
                             match.split('').forEach(function (single) {
+                                arg = args[argIndex];
                                 if (param.type === 'a') {
                                     if (single === 'm') {
                                         // missing (undefined)
                                         arg = undefined;
                                     } else {
-                                        arg = args[argIndex];
                                         var arrayOK = true;
                                         // is there type information on the contents of the array?
                                         if (typeof param.subtype !== 'undefined') {