The goal of bootstrapping packages which require versioned dependencies, of VCS packages for which the version will only be calculated when actually running makepkg to build the package, is fundamentally incompatible with upfront dependency resolution. In order to install expac-git and aurman at the correct versions, it is necessary to first install expac-git on its own, then install aurman.
This is not a problem to be solved by AUR helpers. AUR helpers can do a lot, but they cannot completely obviate the need for human interaction.
You're a Turing-complete user -- act like it.
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