suppaftp 12 is the FTP client behind the put FTP fallback transport:
the maintained continuation of rust-ftp (4.2M downloads, releases this
month), used with its default features only — a plain blocking FTP
stream, no TLS, no async. It brings just lazy-regex into the tree;
chrono is shared.
parking_lot replaces std sync mutex unwrapping in test code, per the
project rule.
A binary crate should pin its dependency graph: without the lockfile
in git, source and snap builds float transitive versions, so a
0.1.0 artifact rebuilt later would not be the same binary.