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build: use
+
for ES6 template literals
The behavior before is `"".concat(part1, part2, ...)`, which is useless and makes the minified file larger (about 600 bytes). The benefit of `concat` is just supporting `Symbol.toPrimitive`. Therefore, we should replace it with simpler `+`. Doc: * https://babeljs.io/docs/en/babel-plugin-transform-template-literals * babel/babel#5791
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