Implements a proxy-based RPC mechanism over Unix sockets using pickle serialization. Key classes: ProxyDataContainer (a picklable namedtuple-like container for user input/server answers), ProxyID (opaque identifier for remote objects), and helper functions safe_pickle_loads/_RestrictedUnpickler that harden the IPC against arbitrary code execution. The pattern elegantly hides the process boundary, allowing client code to operate on proxied objects almost transparently.

A self-contained GTK3 custom widget for interactive size selection (with support for min/max, reserved size, and parent device management). It loads its own Glade UI, handles signals, and validates user input. Could be extracted and reused in other storage tools that require size-picking with constraints (e.g., LVM extended size, RAID chunk size).

Provides a BlivetGUIConfig class that implements dict-like configuration storage with attribute access (e.g., config.my_key). It is simple, self-contained, and could serve as a lightweight config pattern for any Python application that wants dot-notation access to settings without heavy frameworks.

Defines BlivetUtilsTestCase, a test base class that programmatically creates and destroys virtual SCSI disks using targetcli (fileio backstores). This enables realistic, repeatable storage tests without physical hardware. The pattern is novel and reusable for any project that needs to test partition/format/RAID operations in CI or development environments.