put defaults back the way they were

src/FlatBuffers.jl

@@ -41,9 +41,9 @@ slot_offsets(T) = [4 + ((i - 1) * 2) for i = 1:length(T.types)]
 
 default(T, TT, sym) = default(TT)
 default(::Type{T}) where {T <: Scalar} = zero(T)
-default(::Type{T}) where {T <: AbstractString} = nothing
+default(::Type{T}) where {T <: AbstractString} = ""
 default(::Type{T}) where {T <: Enum} = enumtype(T)(T(0))
-default(::Type{Vector{T}}) where {T} = nothing
+default(::Type{Vector{T}}) where {T} = T[]
 
 # attempt to call default constructors for the type,
 # use above methods as fallback

test/MyGame/Example/Monster.jl

@@ -12,20 +12,20 @@ FlatBuffers.@with_kw mutable struct Monster{T}
     pos::Union{Vec3, Nothing} = nothing
     mana::Int16 = 150
     hp::Int16 = 100
-    name::Union{String, Nothing} = nothing
-    inventory::Union{Vector{UInt8}, Nothing} = nothing
+    name::String = ""
+    inventory::Vector{UInt8} = []
     color::Color = 8
     test_type::UInt8 = 0
     test::T = nothing
-    test4::Union{Vector{Test}, Nothing} = nothing
-    testarrayofstring::Union{Vector{String}, Nothing} = nothing
+    test4::Vector{Test} = []
+    testarrayofstring::Vector{String} = []
 #=
 #  an example documentation comment: this will end up in the generated code
 #  multiline too
 =#
-    testarrayoftables::Union{Vector{Monster{T}}, Nothing} = nothing
+    testarrayoftables::Vector{Monster{T}} = []
     enemy::Union{Monster{T}, Nothing} = nothing
-    testnestedflatbuffer::Union{Vector{UInt8}, Nothing} = nothing
+    testnestedflatbuffer::Vector{UInt8} = []
     testempty::Union{Stat, Nothing} = nothing
     testbool::Bool = false
     testhashs32_fnv1::Int32 = 0
@@ -36,29 +36,30 @@ FlatBuffers.@with_kw mutable struct Monster{T}
     testhashu32_fnv1a::UInt32 = 0
     testhashs64_fnv1a::Int64 = 0
     testhashu64_fnv1a::UInt64 = 0
-    testarrayofbools::Union{Vector{Bool}, Nothing} = nothing
+    testarrayofbools::Vector{Bool} = []
     testf::Float32 = 3.14159
     testf2::Float32 = 3.0
     testf3::Float32 = 0.0
-    testarrayofstring2::Union{Vector{String}, Nothing} = nothing
-    testarrayofsortedstruct::Union{Vector{Ability}, Nothing} = nothing
-    flex::Union{Vector{UInt8}, Nothing} = nothing
-    test5::Union{Vector{Test}, Nothing} = nothing
-    vector_of_longs::Union{Vector{Int64}, Nothing} = nothing
-    vector_of_doubles::Union{Vector{Float64}, Nothing} = nothing
+    testarrayofstring2::Vector{String} = []
+    testarrayofsortedstruct::Vector{Ability} = []
+    flex::Vector{UInt8} = []
+    test5::Vector{Test} = []
+    vector_of_longs::Vector{Int64} = []
+    vector_of_doubles::Vector{Float64} = []
     parent_namespace_test::Union{InParentNamespace, Nothing} = nothing
-    vector_of_referrables::Union{Vector{Referrable}, Nothing} = nothing
+    vector_of_referrables::Vector{Referrable} = []
     single_weak_reference::UInt64 = 0
-    vector_of_weak_references::Union{Vector{UInt64}, Nothing} = nothing
-    vector_of_strong_referrables::Union{Vector{Referrable}, Nothing} = nothing
+    vector_of_weak_references::Vector{UInt64} = []
+    vector_of_strong_referrables::Vector{Referrable} = []
     co_owning_reference::UInt64 = 0
-    vector_of_co_owning_references::Union{Vector{UInt64}, Nothing} = nothing
+    vector_of_co_owning_references::Vector{UInt64} = []
     non_owning_reference::UInt64 = 0
-    vector_of_non_owning_references::Union{Vector{UInt64}, Nothing} = nothing
-    # any_unique_type::UInt8 = 0
-    # any_unique::AnyUniqueAliases = nothing
-    # any_ambiguous_type::UInt8 = 0
-    # any_ambiguous::AnyAmbiguousAliases = nothing
+    vector_of_non_owning_references::Vector{UInt64} = []
+    #= any_unique_type::UInt8 = 0 =#
+    #= any_unique::AnyUniqueAliases = nothing =#
+    #= any_ambiguous_type::UInt8 = 0 =#
+    #= any_ambiguous::AnyAmbiguousAliases = nothing =#
+    vector_of_enums::Vector{Color} = []
 end
 FlatBuffers.@ALIGN(Monster, 1)
 FlatBuffers.slot_offsets(::Type{T}) where {T<:Monster} = [
@@ -73,7 +74,7 @@ FlatBuffers.slot_offsets(::Type{T}) where {T<:Monster} = [
     0x00000046, 0x00000048, 0x0000004A, 0x0000004C, 
     0x0000004E, 0x00000050, 0x00000052, 0x00000054, 
     0x00000056, 0x00000058, 0x0000005A, 0x0000005C, 
-    0x0000005E, 0x00000060
+    0x0000005E, 0x00000060, 0x00000062
 ]
 FlatBuffers.root_type(::Type{T}) where {T<:Monster} = true
 FlatBuffers.file_identifier(::Type{T}) where {T<:Monster} = "MONS"

test/MyGame/Example/Stat.jl

@@ -5,7 +5,7 @@
 import FlatBuffers
 
 FlatBuffers.@with_kw mutable struct Stat
-    id::Union{String, Nothing} = nothing
+    id::String = ""
     val::Int64 = 0
     count::UInt16 = 0
 end

test/MyGame/Example/TypeAliases.jl

@@ -15,8 +15,8 @@ FlatBuffers.@with_kw mutable struct TypeAliases
     u64::UInt64 = 0
     f32::Float32 = 0.0
     f64::Float64 = 0.0
-    v8::Union{Vector{Int8}, Nothing} = nothing
-    vf64::Union{Vector{Float64}, Nothing} = nothing
+    v8::Vector{Int8} = []
+    vf64::Vector{Float64} = []
 end
 FlatBuffers.@ALIGN(TypeAliases, 1)
 FlatBuffers.slot_offsets(::Type{T}) where {T<:TypeAliases} = [

test/flatc.jl

@@ -48,7 +48,7 @@ function checkmonster(monster)
     @test sum([test0.a, test0.b, test1.a, test1.b]) == 100
 
     @test monster.testarrayofstring == ["test1", "test2"]
-    @test monster.testarrayoftables == nothing
+    @test monster.testarrayoftables == []
     @test monster.testf == 3.14159f0
 end