Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/PersistentStringHash/BUILD

@@ -0,0 +1,15 @@
+load("@build_bazel_rules_swift//swift:swift.bzl", "swift_library")
+
+swift_library(
+    name = "PersistentStringHash",
+    module_name = "PersistentStringHash",
+    srcs = glob([
+		"Sources/**/*.swift",
+    ]),
+    copts = [
+        "-warnings-as-errors",
+    ],
+    visibility = [
+        "//visibility:public",
+    ],
+)

submodules/PersistentStringHash/Sources/StringHash.swift

@@ -0,0 +1,12 @@
+import Foundation
+
+public extension String {
+    var persistentHashValue: UInt64 {
+        var result = UInt64 (5381)
+        let buf = [UInt8](self.utf8)
+        for b in buf {
+            result = 127 * (result & 0x00ffffffffffffff) + UInt64(b)
+        }
+        return result
+    }
+}