no type conversion, add small test for positive weights

Author: matbesancon

src/matchings.jl

@@ -33,7 +33,7 @@ function FrankWolfe.compute_extreme_point(
 ) where {M}
     N = length(direction)
     if v === nothing
-        v = spzeros(N)
+        v = spzeros(Int, N)
     else
         v .= 0
     end

test/runtests.jl

@@ -61,6 +61,8 @@ end
         end
     end
     @test v_sol == v
+    v2 = FrankWolfe.compute_extreme_point(lmo, ones(M))
+    @test norm(v2) == 0
 end