This release:

• adds hardware single-precision floating-point numerics support (except on the RP2040, due to lack of hardware floating point, and STM32F411, to save room of what little flash it has)
• reworks the multitasker to be based on deadlines
• optionally supports complex numbers on top of hardware single-precision floating-point numerics
• adds a current directory concept
• optionally supports FAT32 filesystems in PSRAM on RP2350 boards with PSRAM such as the Pimoroni Pico Plus 2
• supports conveniently compiling string constants to the dictionary and storing them in buffers and reading them therefrom without the limitations of traditional counted strings or null-delimited strings
• optimizes of/ofstr ... endof to collect all end branches to the end of case ... endcase/endcasestr blocks (except on the RP2040 and STM32L476, due to the limitations of these platforms)
• fixes a bug where double-cell local variables would not be properly updated with constants due to an issue with the code generator
• fixes a bug introduced in the last beta release 1.9.0-beta.3 where due to an issue with the multitasker zeptoforth would sometimes crash on boot and would not properly update the deadlines of tasks.