[TSCBasic] Avoid chances of ambiguity in JSONMapper
[TSCBasic] Avoid chances of ambiguity in JSONMapper

Swift compiler thinks this method is recursive in Swift 5 mode.

abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager