using afIocusing afIocConfigusing afIocEnvusing afBedSheet::BedSheetMetaData** Cold Feet's strategy for generating checksums based on a file. constmixin ChecksumStrategy {** Return a checksum for the given file. The checksum must NOT contain the character '/'.abstract Str checksum(File file)}** A `ChecksumStrategy` that returns the application's version number in production, and a random string in development.constclass ChecksumFromAppVersion : ChecksumStrategy {privateconst Str appVersionnew make(IocEnv iocEnv, BedSheetMetaData meta){this.appVersion = iocEnv.isDev ? Int.random.toHex(8)[0..8] : "v" + meta.appPod?.version?.segments?.join("-")}override Str checksum(File file){ appVersion}}** A `ChecksumStrategy` that returns a constant value - use during testing.constclass ChecksumFromConstValue : ChecksumStrategy {privateconst Str myChecksumnew make(Str myChecksum){this.myChecksum = myChecksum}override Str checksum(File file){ myChecksum}}