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Replace the arity library with a new evaluation engine based on
an open source "constructive reals" library. This provides answers
that are correct to the last displayed digit, and can be scrolled to
get more precision, with evaluation to additional precision
proceeding on demand.
This uses pieces of an old prototype calculator with a
pre-Material-Design UI. Since the code structure of the KitKat and
Lollipop calculators is quite different, this merge required major
changes to make the pieces fit again. An egregious bug in the
prototype related to the evaluation of the power operator was
fixed. Many new UI bugs are introduced to compensate :-)
Add separate buttons for inverse trig functions.
Add long TODO lists for various missing pieces.
This is really designed to get something up and running
that looks like it has a Material Design UI.
This version kind of works, though with many UI deficiencies.
This addresses external issues 63368, 81089, and 80990. It
partially address the degree vs radian (80330) issue as well,
though we're still missing the UI for that.
This fixes
Bug:15284587
(More work is needed to make this interact correctly with keyboard support.)
Degree/Radian mode is also internal
Bug:17059768
This provides much more robust solutions to the following, which were
previously fixed by favoring round numbers over precise solutions:
Bug:15747298
Bug:15332726
Change-Id: Ib64ffcee9760a3195ae2a48302308eeb09a156bd
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