This reduces compile times and binary sizes. It should also fix compilation with compilers not able to handle Boost.Phoenix (see #11200).
Also, date/time format has changed. The default formatter will produce dates with numeric months instead of abbreviated month names (see #8839).
The standard attribute value types supported by default parsed formatters now include char16_t and char32_t, when available. This required to add new code conversion routines.
Added Boost.PP sequences with the standard types. These are used to generate the corresponding type sequences, which is faster to compile than doing this with Boost.MPL.
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