Stop using Guava's immutable collection types in public getters?

[davidxia]

This library can cause issues for projects that use its shaded jar and a different version of guava. Should we make a breaking change and stop using Guava's immutable collection types in public getters?

See spotify/helios#1142

[johnflavin]

I know that when the abstract getters return Immutable* collection types, AutoValue will generate implementations that also use the Immutable* types. Do you know what collection types AutoValue will generate if your abstract getters do not return the Immutable* types?

I don't know if this matters.

[stale]

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