framework/i18n/Formatter.php
protected function asIntegerStringFallback($value)
    {
        if (empty($value)) {
            $value = 0;
        }

        $value = $this->normalizeNumericStringValue((string) $value);
        $separatorPosition = strrpos($value, '.');

        if ($separatorPosition !== false) {
            $integerPart = substr($value, 0, $separatorPosition);
        } else {
            $integerPart = $value;
        }

        return $this->asDecimalStringFallback($integerPart, 0);
    }
protected function asIntegerStringFallback($value)
    {
        if (empty($value)) {
            $value = 0;
        }

        $value = $this->normalizeNumericStringValue((string) $value);
        $separatorPosition = strrpos($value, '.');

        if ($separatorPosition !== false) {
            $integerPart = substr($value, 0, $separatorPosition);
        } else {
            $integerPart = $value;
        }

        return $this->asDecimalStringFallback($integerPart, 0);
    }
Fallback for formatting value as an integer number by removing any decimal digits without rounding.

@param string|int|float $value the value to be formatted.
@return string the formatted result.
@since 2.0.16