Store enums wider than int at full width instead of truncating#354
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Enumerator serialization cast every value to `int` on save and back on load. For an `enum` whose underlying type does not fit in an `int`, for example a scoped enum on long long with a value above `INT_MAX`, that cast silently truncated the value, and users could not intervene because the archive routes every enum through this path before any user serialization is consulted. An enum is now saved through an integer sized to its underlying type: int when the underlying type is no wider than int, otherwise the underlying type itself. The common case (including scoped enums that do not name a type, and narrow underlying types such as char, which stay on the int path to avoid the archives' character handling) is byte for byte identical to before, so existing archives and data are unaffected. Only enums that genuinely need the extra width change on the wire, and those were being corrupted anyway. The archive library version is bumped to 21. Fixes #353.
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Enumerator serialization cast every value to
inton save and back on load. For anenumwhose underlying type does not fit in anint, for example a scoped enum on long long with a value aboveINT_MAX, that cast silently truncated the value, and users could not intervene because the archive routes every enum through this path before any user serialization is consulted.An enum is now saved through an integer sized to its underlying type: int when the underlying type is no wider than int, otherwise the underlying type itself. The common case (including scoped enums that do not name a type, and narrow underlying types such as char, which stay on the int path to avoid the archives' character handling) is byte for byte identical to before, so existing archives and data are unaffected. Only enums that genuinely need the extra width change on the wire, and those were being corrupted anyway.
The archive library version is bumped to 21.
Fixes issue #353.