Fluent Builder API vs Builder pattern

[jansupol]

The current Loader API looks

Loader.bootstrap().load()

However, we probably want to add other enrichments to the API, such as converters or sources. Then we would have something like

Loader.bootstrap().converter(...).source(...).load()

Which would make Loader mutable. Then we have two possibilities:

1. To return a new instance of Loader for each converter, source, and other calls
2. To use a Builder pattern using Loader.bootstrap().build().load() which would more nicely turn into Loader.builder().build().load()

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In summary, should we use bootstrap() method, or builder() method?