Fix: Consider metadata in BasicSymbolic isequal

Author: bowenszhu

src/types.jl

@@ -245,6 +245,7 @@ function Base.isequal(a::BasicSymbolic{T}, b::BasicSymbolic{S}) where {T,S}
     E === exprtype(b) || return false
 
     T === S || return false
+    isequal(metadata(a), metadata(b)) || return false
     return _isequal(a, b, E)::Bool
 end
 function _isequal(a, b, E)

test/basics.jl

@@ -336,6 +336,12 @@ end
 
     @test !isequal(a, missing)
     @test !isequal(missing, b)
+
+    a1 = setmetadata(a, Ctx1, "meta_1")
+    a2 = setmetadata(a, Ctx1, "meta_1")
+    a3 = setmetadata(a, Ctx2, "meta_2")
+    @test isequal(a1, a2)
+    @test !isequal(a1, a3)
 end
 
 @testset "subtyping" begin