istream-seekable: When read() reaches EOF, unreference underlying streams. This was already done when the stream was kept in memory, but not when when the stream was written to temporary file.
istream-seekable: When read() reaches EOF, unreference underlying streams.
This was already done when the stream was kept in memory, but not when when
the stream was written to temporary file.

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot