1.2.0

Added

• LZMAError.ioFailure(operation:code:) and XZError.ioFailure(operation:code:), carrying the raw POSIX errno from a failed read/write syscall
• CustomNSError conformance on LZMAError and XZError: an ioFailure now bridges to an NSError whose NSUnderlyingErrorKey is an NSPOSIXErrorDomain error, so callers can detect conditions such as ENOSPC (disk full) by type instead of parsing error strings

Changed

• FileHandle streaming read/write syscall failures now throw ioFailure(operation:code:) instead of internalError(_:) with a preformatted string. The human-readable description/failureReason text is unchanged, but code that exhaustively switches over LZMAError/XZError will need to handle the new case (@unknown default recommended)