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Feature request: option to disallow deserializing union cases with private constructors

Status: Open.

#215 In Tarmil/FSharp.SystemTextJson;

· reinux opened on May 29, 2026

Add per-type override methods

enhancementNew feature or requestNew feature or request

Status: Open.

#214 In Tarmil/FSharp.SystemTextJson;

· Tarmil opened on Apr 22, 2026

Add SkippableOptionFields value for deserialization only

Status: Open.

#209 In Tarmil/FSharp.SystemTextJson;

· cmeeren opened on Jan 23, 2026

JsonUnmappedMemberHandling.Disallow has no effect when using JsonFSharpConverter

Status: Open.

#208 In Tarmil/FSharp.SystemTextJson;

· cmeeren opened on Jan 20, 2026

Utf8JsonReader.Skip() fails when Utf8JsonReader.IsFinalBlock is false (streaming scenarios only?)

bugSomething isn't workingSomething isn't working

Status: Open.

#206 In Tarmil/FSharp.SystemTextJson;

· fcallejon opened on Dec 17, 2025

FSharpLuLike should include WithUnionTagCaseInsensitive

Status: Open.

#190 In Tarmil/FSharp.SystemTextJson;

· cmeeren opened on Sep 3, 2024

Do not use FSharp.SystemTextJson on types that do not have the [<JsonFSharpConverter>] attribute

Status: Open.

#187 In Tarmil/FSharp.SystemTextJson;

· Bananas-Are-Yellow opened on Jun 3, 2024

Allowing null fields example from the docs is not working

Status: Open.

#186 In Tarmil/FSharp.SystemTextJson;

· paredes-intracen opened on May 29, 2024

Custom serializer/JsonConverter for a record

Status: Open.

#185 In Tarmil/FSharp.SystemTextJson;

· rynoV opened on Apr 25, 2024

Untagged Attribute and options configurations don't seem to be working

Status: Open.

#183 In Tarmil/FSharp.SystemTextJson;

· vitash opened on Mar 25, 2024

Incorrect missing field name - seems to pick name of first null field, even if field is optional

Status: Open.

#178 In Tarmil/FSharp.SystemTextJson;

· cmeeren opened on Jan 20, 2024

WithUnwrapOption(false) still serializes None as null

enhancementNew feature or requestNew feature or request

Status: Open.

#171 In Tarmil/FSharp.SystemTextJson;

· cmeeren opened on Aug 21, 2023