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tomli has rapidly become the de-facto standard. It's also compatible with some changes made for TOML version 1.0, which people are going to want to use.
This means the end of the line for Python 3.4 and 3.5 support in flit_core. Projects which still support those versions will need to ensure they can be built by flit_core version 3.3.0 (which means sticking to TOML 0.5). Both of those Python versions are already end-of-life in that they're not getting bugfix releases, so hopefully not many people are affected by this.