PropertyWrappers: Compiler crashes (trap 6) when used with initial value + default param

import Foundation

@propertyWrapper
struct UserDefault<T> {
    let key: String
    let defaultValue: T
    let suite: UserDefaults

    var wrappedValue: T {
        get { suite.object(forKey: key) as? T ?? defaultValue }
        nonmutating set { suite.set(newValue, forKey: key) }
    }

    init(wrappedValue: T, key: String, suite: UserDefaults = .standard) {
        self.suite = .standard
        self.key = key
        self.defaultValue = wrappedValue
    }
}

class User {
    @UserDefault(wrappedValue: "default1", key: "key1", suite: .standard)
    var value1: String

    @UserDefault(wrappedValue: "default2", key: "key2")
    var value2: String

    @UserDefault(key: "key3", suite: .standard)
    var value3: String = "default3"

    @UserDefault(key: "key4") // trap: 6. Commenting out that line to stop crashing
    var value4: String = "default4"
}

$ DEVELOPER_DIR=/Applications/Xcode-11GM.app swift Contents.swift 
swift(83722,0x124d8c5c0) malloc: *** error for object 0x7ffedfd769a0: pointer being realloc'd was not allocated
swift(83722,0x124d8c5c0) malloc: *** set a breakpoint in malloc_error_break to debug
Stack dump:
0.	Program arguments: /Applications/Xcode-11GM.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret Contents.swift -enable-objc-interop -sdk /Applications/Xcode-11GM.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -color-diagnostics -module-name Contents 
1.	While emitting IR SIL function "@$s8Contents4UserCACycfc".
 for 'init()' (at Contents.swift:23:7)
0  swift                    0x00000001142cbeb3 PrintStackTraceSignalHandler(void*) + 51
1  swift                    0x00000001142cb686 SignalHandler(int) + 358
2  libsystem_platform.dylib 0x00007fff69a9db5d _sigtramp + 29
3  libsystem_platform.dylib 0x00007ffedfd75598 _sigtramp + 1982691928
4  libsystem_c.dylib        0x00007fff699576a6 abort + 127
5  libsystem_malloc.dylib   0x00007fff69a66077 malloc_vreport + 545
6  libsystem_malloc.dylib   0x00007fff69a65e38 malloc_report + 151
7  libsystem_malloc.dylib   0x00007fff69a629b6 realloc + 313
8  swift                    0x000000010fff182d swift::irgen::SingleScalarTypeInfo<(anonymous namespace)::ClassTypeInfo, swift::irgen::ReferenceTypeInfo>::getSchema(swift::irgen::ExplosionSchema&) const + 157
9  swift                    0x00000001101659be swift::SILInstructionVisitor<(anonymous namespace)::IRGenSILFunction, void>::visit(swift::SILInstruction*) + 35646
10 swift                    0x000000011015a30a swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 9866
11 swift                    0x00000001100096f7 swift::irgen::IRGenerator::emitLazyDefinitions() + 9303
12 swift                    0x0000000110137100 performIRGeneration(swift::IRGenOptions&, swift::ModuleDecl*, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> >, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::LLVMContext&, swift::SourceFile*, llvm::GlobalVariable**) + 1344
13 swift                    0x0000000110134809 swift::performIRGeneration(swift::IRGenOptions&, swift::ModuleDecl*, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> >, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::LLVMContext&, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, llvm::GlobalVariable**) + 825
14 swift                    0x000000010ff238fb performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 37051
15 swift                    0x000000010ff17034 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 6820
16 swift                    0x000000010fea45a3 main + 1219
17 libdyld.dylib            0x00007fff698b23d5 start + 1
[1]    83722 abort      DEVELOPER_DIR=/Applications/Xcode-11GM.app swift Contents.swift