This release fixes outstanding issues with multiprocessing on the Raspberry Pi Pico and other compatible RP2040-based boards, where one could not write to flash after the second core had been booted without undefined conditions resulting, and where one could not erase flash after the second core had been booted and then write to flash afterwards without the MCU locking up. This release also adds a new heap allocator which now uses free lists to allocate memory and which eliminates some apparent bugs in the old heap allocator.