Use processed format string even on old rust, but as String #185
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Neither approach is flawless: prior to this commit you'd get
anyhow!("{{")turned into error message"{"on new compilers and"{{"on old compilers but both as&str; after this commit they'd both be unescaped consistently to"{"but on new compilers it's downcastable to&strwhile on old compilers it'sString. This way is overall less likely to be troublesome but I am open to inverting this back.