Start fixing ambiguities

Author: mtfishman

src/abstractblocksparsearray/views.jl

@@ -189,6 +189,18 @@ function Base.view(
 ) where {T,N}
   return viewblock(a, block...)
 end
+# Fix ambiguity error with BlockArrays.jl.
+function Base.view(
+  a::SubArray{
+    T,
+    N,
+    <:AbstractBlockSparseArray{T,N},
+    <:Tuple{Vararg{Union{Base.Slice,BlockSlice{Union{},<:Integer}},N}},
+  },
+  block::Block{N},
+) where {T,N}
+  return viewblock(a, block)
+end
 
 # XXX: TODO: Distinguish if a sub-view of the block needs to be taken!
 # Define a new `SubBlockSlice` which is used in:
@@ -327,6 +339,11 @@ function BlockArrays.viewblock(
   end
   return @view parent(a)[brs...]
 end
+
+## function BlockArrays.viewblock
+##   a::SubArray{
+##     T,N,<:AbstractBlockSparseArray{T,N},<:Tuple{Vararg{Union{Base.Slice, BlockArrays.BlockSlice{Union{}, T} where T<:Integer, BlockSparseArrays.BlockIndices{Union{}, T} where T<:Integer},N}}, ::Vararg{Block{1}, N}) where {T, N}
+
 # TODO: Define `@interface interface(a) viewblock`.
 function BlockArrays.viewblock(
   a::SubArray{