[boost] Re: [multi] Formal Review Begins

Hello Seth, Yes `multi::extensions_t` and `a.extensions()` does read as off. But Boost.Multi has already a container called 'extents' (https://github.com/correaa/boost-multi/blob/b7f4dcf08b18628e1ae7aba9f44f7124...) Which does make use of `extensions_type`. From what I understand so far about the library's design, `extensions_type serves as an underlying type of the `extents` type, which could explain the odd naming. Best, Amlal