Should Go runtime ATN export some fields?

[vczyh]

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For example, I want access ruleToStartState field, but it is not exported.

Go can't https://github.com/antlr/antlr4/blob/2a7904a595479954ccfb1c78124fc3d7f5bebcb1/runtime/Go/antlr/v4/atn.go#L42

But javascript can. https://github.com/antlr/antlr4/blob/2a7904a595479954ccfb1c78124fc3d7f5bebcb1/runtime/JavaScript/src/antlr4/atn/ATN.d.ts#L11