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1.2.4
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arrow-optics
/
arrow.optics
/
Optional
Optional
fun
<
S
,
A
>
Optional
(
getOption
:
(
source
:
S
)
->
Option
<
A
>
,
set
:
(
source
:
S
,
focus
:
A
)
->
S
)
:
Optional
<
S
,
A
>
(
source
)