Feature: to_dict(key, duplicated=reducer)

[kitsuyui]

Allow to pass reducer to to_dict.
This makes it possible to select items according to specific conditions when keys are duplicated.
For example, it will be possible to take out the largest item and take out the smallest item.

from dataclasses import dataclass
from richset import RichSet


@dataclass(frozen=True)
class Something:
    id: int
    name: str


rs = RichSet.from_list(
    [
        Something(1, "john"),
        Something(2, "jane"),
        Something(3, "john"),  # name duplicated
    ]
)

rs.to_dict(
    lambda r: r.name,
    duplicated=lambda items: min(items, key=lambda item: item.id),
)
# => {"john": Something(1, "john"), "jane": Something(2, "jane")}
rs.to_dict(
    lambda r: r.name,
    duplicated=lambda items: max(items, key=lambda item: item.id),
)
# => {"john": Something(3, "john"), "jane": Something(2, "jane")}

Close: #13

[codecov-commenter]

Codecov Report

Merging #14 (1c887d1) into main (287a68f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          195       196    +1     
=========================================
+ Hits           195       196    +1     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
richset/__init__.py	100.00% <100.00%> (ø)

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