Constant UPDATE_FIELDS 

pub const UPDATE_FIELDS: &str = r#"mutation($input:UpdateProjectV2ItemFieldValueInput!,$second:UpdateProjectV2ItemFieldValueInput!,$third:UpdateProjectV2ItemFieldValueInput!,$fourth:UpdateProjectV2ItemFieldValueInput!,$fifth:UpdateProjectV2ItemFieldValueInput!,$sixth:UpdateProjectV2ItemFieldValueInput!,$clear:ClearProjectV2ItemFieldValueInput!,$clearSecond:ClearProjectV2ItemFieldValueInput!,$clearThird:ClearProjectV2ItemFieldValueInput!,$writeFirst:Boolean!,$writeSecond:Boolean!,$writeThird:Boolean!,$writeFourth:Boolean!,$writeFifth:Boolean!,$writeSixth:Boolean!,$writeClear:Boolean!,$writeClearSecond:Boolean!,$writeClearThird:Boolean!){updateProjectV2ItemFieldValue(input:$input) @include(if:$writeFirst){projectV2Item{id}} second:updateProjectV2ItemFieldValue(input:$second) @include(if:$writeSecond){projectV2Item{id}} third:updateProjectV2ItemFieldValue(input:$third) @include(if:$writeThird){projectV2Item{id}} fourth:updateProjectV2ItemFieldValue(input:$fourth) @include(if:$writeFourth){projectV2Item{id}} fifth:updateProjectV2ItemFieldValue(input:$fifth) @include(if:$writeFifth){projectV2Item{id}} sixth:updateProjectV2ItemFieldValue(input:$sixth) @include(if:$writeSixth){projectV2Item{id}} cleared:clearProjectV2ItemFieldValue(input:$clear) @include(if:$writeClear){projectV2Item{id}} clearedSecond:clearProjectV2ItemFieldValue(input:$clearSecond) @include(if:$writeClearSecond){projectV2Item{id}} clearedThird:clearProjectV2ItemFieldValue(input:$clearThird) @include(if:$writeClearThird){projectV2Item{id}}}"#;

Writes up to six board fields and clears up to three in one ordered mutation: every aliased field is included by its own boolean, as FIELD_WRITE_SLOTS and FIELD_CLEAR_SLOTS name them, writes before clears.