Hi,
WDYT about adding a `strict: boolean` option to `Keyword.validate/2` that
would make it return an error if a key that doesn't have a default value
provided is absent? The returned value in case of an error could be
`{:error, unknown_keys, missing_keys}`, for example:
{:error, [], [:b]} = Keyword.validate([a: :foo], [:a, :b], strict: true)
{:error, [:c], [:b]} = Keyword.validate([a: :foo, c: :bar], [:a, :b],
strict: true)
{:error, [:c], []} = Keyword.validate([a: :foo, b: :foobar, c: :bar], [:a,
:b], strict: true)
in case of success, the result would remain as it is now:
{:ok, [a: :foo, b: :bar]} = Keyword.validate([a: :foo, b: :bar], [:a, :b],
strict: true)
{:ok, [b: :bar, a: :foo]} = Keyword.validate([a: :foo], [:a, b: :bar],
strict: true)
The behaviour would be unchanged when the strict is set to false (default).
The bang version would be adjusted accordingly.
Thanks ;)
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