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GBMatrix{T, F} <: AbstractSparseArray{T, UInt64, 2}
Two-dimensional GraphBLAS array with elements of type T. F is the type of the fill-value, which is typically Nothing or T. Internal
representation is specified as opaque, but in this implementation is stored as one of the following in either row or column orientation:
1. Dense
2. Bitmap
3. Sparse Compressed
4. Hypersparse
The storage type is automatically determined by the library.