Made Booleans a first-class type. (0.23.0)

examples/boolean_decl.fun

@@ -0,0 +1,6 @@
+#!/usr/bin/env fun
+
+boolean b = false
+print("b => " + to_string(b))
+/* Try typeof via built-in function if available */
+print("typeof(b) => " + typeof(b))

examples/booleans.fun

@@ -0,0 +1,52 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ */
+
+// Boolean datatype usage examples (first-class booleans)
+// Run like:
+//   FUN_LIB_DIR="$(pwd)/lib" ./build/fun examples/booleans.fun
+
+// Literals
+boolean t = true
+print("typeof(t) => " + typeof(t))
+boolean f = false
+print("typeof(f) => " + typeof(f))
+
+print("t literal => " + to_string(t))          // "true"
+print("f literal => " + to_string(f))          // "false"
+
+// Logical operators (short-circuit semantics)
+print("true && true  => " + to_string(true && true))
+print("true && false => " + to_string(true && false))
+print("false || true => " + to_string(false || true))
+print("false || false => " + to_string(false || false))
+print("!true => " + to_string(!true))
+print("!false => " + to_string(!false))
+
+// Equality and inequality
+print("true == true => " + to_string(true == true))
+print("true != false => " + to_string(true != false))
+
+// Interoperability with 0/1 (still supported)
+print("true == 1 => " + to_string(true == 1))
+print("false == 0 => " + to_string(false == 0))
+print("1 == true => " + to_string(1 == true))
+print("0 != true => " + to_string(0 != true))
+
+// Use in conditionals
+if t
+  print("if t: branch taken")
+else
+  print("if t: branch NOT taken")
+
+if f
+  print("if f: branch taken (unexpected)")
+else
+  print("if f: else branch taken")