fix: chain operator should respect array constructor

src/parser.js

@@ -1194,6 +1194,7 @@ const parser = (() => {
                             result = {type: 'apply', value: expr.value, position: expr.position};
                             result.lhs = processAST(expr.lhs);
                             result.rhs = processAST(expr.rhs);
+                            result.keepArray = result.lhs.keepArray || result.rhs.keepArray;
                             break;
                         default:
                             result = {type: expr.type, value: expr.value, position: expr.position};

test/test-suite/groups/hof-map/case0010.json

@@ -0,0 +1,6 @@
+{
+    "expr": "( $square := function($x){$x*$x}; $map([1], $square)[] )",
+    "data": null,
+    "bindings": {},
+    "result": [1]
+}

test/test-suite/groups/hof-map/case0011.json

@@ -0,0 +1,6 @@
+{
+    "expr": "( $data := [1]; $square := function($x){$x*$x}; $data ~> $map($square)[] )",
+    "data": null,
+    "bindings": {},
+    "result": [1]
+}