Add Support for BitVector and BitMatrix Indexing

Fixes #707.

Author: RoyiAvital

src/atoms/IndexAtom.jl

@@ -109,19 +109,11 @@ function Base.getindex(x::AbstractExpr, rows::AbstractVector{<:Real}, col::Real)
     return getindex(x, rows, col:col)
 end
 
-function Base.getindex(x::AbstractExpr, I::AbstractMatrix{Bool})
+function Base.getindex(x::AbstractExpr, I::Union{AbstractMatrix{Bool}, <:BitMatrix})
     return [xi for (xi, ii) in zip(x, I) if ii]
 end
 
-function Base.getindex(x::AbstractExpr, I::AbstractVector{Bool})
-    return [xi for (xi, ii) in zip(x, I) if ii]
-end
-
-function Base.getindex(x::AbstractExpr, I::BitMatrix)
-    return [xi for (xi, ii) in zip(x, I) if ii]
-end
-
-function Base.getindex(x::AbstractExpr, I::BitVector)
+function Base.getindex(x::AbstractExpr, I::Union{<:AbstractVector{Bool}, <:BitVector})
     return [xi for (xi, ii) in zip(x, I) if ii]
 end