Partial Type

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/FormattingHelpers.CountDigits.cs

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/FormattingHelpers.CountDigits.Int128.cs

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Utf8Formatter/FormattingHelpers.cs