Make MArray stay mutable

Author: YingboMa

src/abstractarray.jl

@@ -78,8 +78,8 @@ similar_type(::Type{A},::Type{T},s::Size{S}) where {A<:AbstractArray,T,S} = defa
 default_similar_type(::Type{T}, s::Size{S}, ::Type{Val{D}}) where {T,S,D} = SArray{Tuple{S...},T,D,prod(s)}
 
 
-# should mutable things stay mutable?
-#similar_type{SA<:Union{MVector,MMatrix,MArray},T,S}(::Type{SA},::Type{T},s::Size{S}) = mutable_similar_type(T,s,length_val(s))
+# should mutable things stay mutable? yes
+similar_type(::Type{SA},::Type{T},s::Size{S}) where {SA<:Union{MVector,MMatrix,MArray},T,S} = mutable_similar_type(T,s,length_val(s))
 
 mutable_similar_type(::Type{T}, s::Size{S}, ::Type{Val{D}}) where {T,S,D} = MArray{Tuple{S...},T,D,prod(s)}