Why does FormatTime() use absl::string_view as "format" string instead of a constexpr?
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The [FormatTime()](https://github.com/abseil/abseil-cpp/blob/master/absl/time/time.h#L1307) API is:
```
std::string FormatTime(absl::string_view format, Time t, TimeZone tz);
```
The `format` argument is generally a `constexpr`, as in [StrFormat()](https://github.com/abseil/abseil-cpp/blob/master/absl/strings/str_format.h#L338)
Can anyone explain why `FormatTime()` accepts a `absl::string_view` as the `format` string instead of a `constexpr`?
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