Skip past false,true,null directly if buffered

src/parser3.h

@@ -223,23 +223,50 @@ inline WeaselJsonStatus n_value(Parser3 *self) {
   case 't':
     ++self->buf;
     self->pop();
+    if (self->len() >= 3) {
+      if (memcmp(self->buf, "rue", 3) == 0) {
+        self->callbacks->on_true_literal(self->data);
+        self->buf += 3;
+      } else {
+        return WeaselJson_REJECT;
+      }
+    } else {
       if (auto s = self->push({T_R, T_U, N_TRUE})) {
         return s;
       }
+    }
     break;
   case 'f':
     ++self->buf;
     self->pop();
+    if (self->len() >= 4) {
+      if (memcmp(self->buf, "alse", 4) == 0) {
+        self->callbacks->on_false_literal(self->data);
+        self->buf += 4;
+      } else {
+        return WeaselJson_REJECT;
+      }
+    } else {
       if (auto s = self->push({T_A, T_L, T_S, N_FALSE})) {
         return s;
       }
+    }
     break;
   case 'n':
     ++self->buf;
     self->pop();
+    if (self->len() >= 3) {
+      if (memcmp(self->buf, "ull", 3) == 0) {
+        self->callbacks->on_null_literal(self->data);
+        self->buf += 3;
+      } else {
+        return WeaselJson_REJECT;
+      }
+    } else {
       if (auto s = self->push({T_U, T_L, N_NULL})) {
         return s;
       }
+    }
     break;
   default:
     return WeaselJson_REJECT;