Hi,
Given a RegExp object `rx` and a string `f` that contains legal RegExp flag
characters, should ideally the following expressions
```js
RegExp(rx, f)
eval("/" + rx.source + "/" + f)
```
always return a functional regexp?
Practical example: `rx = /\-/`, and `f === "u"` (recall that `\-` is invalid in
u-regexps but valid in non-u-regexps).
One may wish that `RegExp(/\-/, "u")` and `eval("/" + /\-/.source + "/u")` be
both equivalent to `/-/u`.
Context: That question came up while I was thinking about a possible precise
specification for `RegExp.prototype.source`.
—Claude
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