eth2.0-specs/configs/constant_presets/README.md

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# Constant Presets
This directory contains a set of constants presets used for testing, testnets, and mainnet.
A preset file contains all the constants known for its target.
Later-fork constants can be ignored, e.g. ignore phase1 constants as a client that only supports phase 0 currently.
## Format
Each preset is a key-value mapping.
**Key**: an `UPPER_SNAKE_CASE` (a.k.a. "macro case") formatted string, name of the constant.
**Value**: can be any of:
- an unsigned integer number, can be up to 64 bits (incl.)
- a hexadecimal string, prefixed with `0x`
Presets may contain comments to describe the values.
See `mainnet.yaml` for a complete example.