0.3.8

Added

• Support for targets with limited or no atomics support (e.g., riscv32i-*, thumbv6m-*). Requires cfg(target_has_atomic = ...), which was stabilized in Rust 1.60.0.

Fixed

• impl_singleton_token_factory! is now more resistant to exotic environments (e.g., type bool = u32 in an outer scope).