global: snapshot

GUIDELINES.md

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+# Guidelines
+
+## Parser
+
+- Avoid floats as much as possible
+  - Use structs like `WAmount` and `Price` for calculations
+  - **Only** use `WAmount.to_btc()` when inserting or computing inside a dataset. It is **very** expensive.
+- No `Arc`, `Rc`, `Mutex` even from third party libraries, they're slower