multi-any 0.1.1

`MultiAny` is just like `Any` but can downcast to trait objects.
Documentation 
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#[cfg(feature = "nightly")]
pub use {
    multi_any_macro::multi_any,
    std::ptr::{DynMetadata, Pointee, from_raw_parts, from_raw_parts_mut, metadata},
};

#[cfg(not(feature = "nightly"))]
pub use ptr_meta::{
    DynMetadata, Pointee, from_raw_parts, from_raw_parts_mut, metadata, pointee as multi_any,
};