src/ContainerParser/Token.php
public function isValue() : bool
    {
        return
        $this->type === self::TOKEN_STRING ||
        $this->type === self::TOKEN_NUMBER ||
        $this->type === self::TOKEN_NULL ||
        $this->type === self::TOKEN_BOOL_TRUE ||
        $this->type === self::TOKEN_BOOL_FALSE;
    }
public function isValue() : bool
    {
        return
        $this->type === self::TOKEN_STRING ||
        $this->type === self::TOKEN_NUMBER ||
        $this->type === self::TOKEN_NULL ||
        $this->type === self::TOKEN_BOOL_TRUE ||
        $this->type === self::TOKEN_BOOL_FALSE;
    }
Is this a value token?

@return bool