intern these strings and use an ID

[sezna]

petr/petr-ast/src/ast.rs

Lines 233 to 237 in 6c2873b

	// TODO intern these strings and use an ID
	String(String),
	}
	impl std::fmt::Display for Literal {

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This issue was generated by todo-issue based on a TODO comment in 6c2873b. It's been assigned to @sezna because they committed the code.