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Presets
Presets are more extensive than runtime configurations, and generally only applicable during compile-time. Each preset is defined as a directory, with YAML files per fork.
Configurations can extend a preset by setting the PRESET_BASE variable. An
implementation may choose to only support 1 preset per build-target and should
validate the PRESET_BASE variable in the config matches the running build.
Standard presets:
mainnet/: Used in mainnet, mainnet-like testnets (e.g. Hoodi), and spec-testingminimal/: Used in low-resource local dev testnets, and spec-testing
Client implementers may opt to support additional presets, e.g. for extra large
beacon states for benchmarking. See /configs/ for run-time
configuration, e.g. to configure a new testnet.
Forking
Like the config forking, the preset extends with every fork, instead of overwriting previous values. An implementation can ignore preset files as a whole for future forks, and can thus implement stricter compile-time warnings on unrecognized or missing variables in current forks.
Format
The preset format matches the config format.