= io: remove `bytesLeft` in favor of `hasRemaining`
= io: fix SslTlsSupport sending out multiple acks in relation with maxEncryptionChunkSize, fixes #689
Merge pull request #690 from jrudolph/i/689/fix-ssl-chunk-acking

= io: fix SslTlsSupport sending out multiple acks in relation with maxEncryptionChunkSize, fixes #689