Fix RAND function to actually use TE_RAND_SEED and use persistent RNG

Fix stale comment

Author: Blake-Madden

tinyexpr.cpp

@@ -499,16 +499,15 @@ namespace te_builtins
     static te_type te_random()
         {
 #ifdef TE_RAND_SEED
-        std::mt19937 gen(static_cast<unsigned int>(RAND_SEED));
+        static std::mt19937 gen(static_cast<unsigned int>(TE_RAND_SEED));
 #elif defined(TE_RAND_SEED_TIME)
-        std::mt19937 gen(static_cast<unsigned int>(time(nullptr)));
+        static std::mt19937 gen(static_cast<unsigned int>(std::time(nullptr)));
 #else
-        static std::random_device rdev;
-        std::mt19937 gen(rdev());
+        static std::mt19937 gen(std::random_device{}());
 #endif
 
-        std::uniform_real_distribution<te_type> distr(0, 1);
-        return distr(gen);
+        static std::uniform_real_distribution<te_type> distribute(0, 1);
+        return distribute(gen);
         }
 
     [[nodiscard]]

tinyexpr.h

@@ -81,7 +81,7 @@
 constexpr int TINYEXPR_CPP_MAJOR_VERSION = 1;
 constexpr int TINYEXPR_CPP_MINOR_VERSION = 0;
 constexpr int TINYEXPR_CPP_PATCH_VERSION = 1;
-constexpr int TINYEXPR_CPP_TWEAK_VERSION = 0;
+constexpr int TINYEXPR_CPP_TWEAK_VERSION = 1;
 #define TINYEXPR_CPP_COPYRIGHT                                                                     \
     "TinyExpr: Copyright (c) 2015-2020 Lewis Van Winkle\n"                                         \
     "TinyExpr++: Copyright (c) 2020-2025 Blake Madden"
@@ -252,7 +252,7 @@ enum te_variable_flags
     /// @brief Don't update when simple evaluation is run
     ///     (i.e., only updated when expression is compiled).
     TE_PURE = (1 << 0),
-    /// @brief Function that can take 1-7 argument (unused arguments are set to NaN).
+    /// @brief Function that can take 1-24 argument (unused arguments are set to NaN).
     TE_VARIADIC = (1 << 1)
     };