Make sure container type is maintained in constructor (#461)

Author: dlfivefifty

Project.toml

@@ -1,6 +1,6 @@
 name = "BandedMatrices"
 uuid = "aae01518-5342-5314-be14-df237901396f"
-version = "1.7.5"
+version = "1.7.6"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"

src/banded/BandedMatrix.jl

@@ -59,7 +59,7 @@ BandedMatrix{T, C}(::UndefInitializer, (n,m)::NTuple{2,Integer}, (a,b)::NTuple{2
 BandedMatrix{T, C}(::UndefInitializer, (n,m)::NTuple{2,Integer}, (a,b)::NTuple{2,Integer}) where {T, C<:AbstractMatrix{T}} =
     _BandedMatrix(C(undef,max(0,b+a+1),m),n,a,b)
 BandedMatrix{T, C}(::UndefInitializer, (n,m)::NTuple{2,Integer}, (a,b)::NTuple{2,Integer})  where {T<:Number, C<:AbstractMatrix{T}} =
-    _BandedMatrix(fill!(similar(C, max(0,b+a+1),m), zero(T)),n,a,b)
+    _BandedMatrix(fill!(convert(C, similar(C, max(0,b+a+1),m)), zero(T)),n,a,b)
 
 BandedMatrix{T}(::UndefInitializer, nm::NTuple{2,Integer}, ab::NTuple{2,Integer}) where T =
 BandedMatrix{T, Matrix{T}}(undef,nm,ab)