Performance and precision pass (#64)

tests/benchmark/corpus/javascript/safe/safe_ternary_const_branches.js

@@ -0,0 +1,13 @@
+// Companion precision guard to path_traversal_ternary_source.js.  When
+// both ternary branches are constant strings, the segment-strip
+// classifier in `lower_ternary_branch` should not synthesise a Source
+// label, so the assigned variable carries no taint and the downstream
+// sink does not fire.
+const fs = require('fs');
+const express = require('express');
+const app = express();
+
+app.get('/page', (req, res) => {
+  const tier = req.query.premium ? 'premium' : 'standard';
+  fs.readFileSync(`/static/${tier}/index.html`);
+});