# Usage in FSharp
## NullValueHandling
By default [DefaultValueHandling is Ignore](/docs/serializer-settings.md#default-settings). Since F# `Option.None` is treated as null, it will be ignored by default. To include `Option.None` use `VerifierSettings.AddExtraSettings` at module startup:
```fs
VerifierSettings.AddExtraSettings(fun settings -> settings.NullValueHandling
## Async Qwerks
F# does not respect implicit operator conversion. `SettingsTask` uses implicit operator conversion to provide a fluent api in combination with an instance that can be awaited. As such `SettingsTask.ToTask()` needs to be awaited when used inside F#.
Async.AwaitTask
```
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## Full tests
```fs
[]
module Tests
open Xunit
open VerifyTests
open VerifyXunit
open Argon
VerifierSettings.AddExtraSettings(fun settings -> settings.NullValueHandling Async.AwaitTask
[]
let WithFluentSetting () =
Verifier
.Verify(15)
.UseMethodName("customName")
.ToTask()
|> Async.AwaitTask
do ()
```
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