parseSnak: replace InconsistentDataType with @ts-expect-error

following suggestions in
#122 (comment)
#122 (comment)

Author: maxlath

src/helpers/parse_snak.ts

@@ -109,8 +109,8 @@ for (const [ datatype, parser ] of Object.entries(parsers)) {
 }
 
 export function parseSnak (datatype: DataType | void, datavalue: SnakValue, options: SimplifySnakOptions) {
-  // Known case of missing datatype: form.claims, sense.claims, mediainfo.statements
-  datatype = (datatype || datavalue.type) as DataType
+  // @ts-expect-error Known case of missing datatype: form.claims, sense.claims, mediainfo.statements
+  datatype = datatype || datavalue.type
 
   try {
     // Known case requiring normalization

src/types/claim.ts

@@ -5,8 +5,7 @@ import type { parsers } from '../helpers/parse_snak.js'
 export type Rank = 'normal' | 'preferred' | 'deprecated'
 export type SnakType = 'value' | 'somevalue' | 'novalue'
 
-export type InconsistentDataType = 'globecoordinate' | 'musical notation'
-export type DataType = keyof typeof parsers | InconsistentDataType
+export type DataType = keyof typeof parsers
 
 export interface Claim {
   id: Guid