src/JmesPath/FnDispatcher.php
private function validateSeq($from, array $types, $a, $b)
    {
        $ta = Utils::type($a);
        $tb = Utils::type($b);

        if ($ta !== $tb) {
            $msg = "encountered a type mismatch in sequence: {$ta}, {$tb}";
            $this->typeError($from, $msg);
        }

        $typeMatch = ($types && $types[0] == 'any') || in_array($ta, $types);
        if (!$typeMatch) {
            $msg = 'encountered a type error in sequence. The argument must be '
                . 'an array of ' . implode('|', $types) . ' types. '
                . "Found {$ta}, {$tb}.";
            $this->typeError($from, $msg);
        }
    }
private function validateSeq($from, array $types, $a, $b)
    {
        $ta = Utils::type($a);
        $tb = Utils::type($b);

        if ($ta !== $tb) {
            $msg = "encountered a type mismatch in sequence: {$ta}, {$tb}";
            $this->typeError($from, $msg);
        }

        $typeMatch = ($types && $types[0] == 'any') || in_array($ta, $types);
        if (!$typeMatch) {
            $msg = 'encountered a type error in sequence. The argument must be '
                . 'an array of ' . implode('|', $types) . ' types. '
                . "Found {$ta}, {$tb}.";
            $this->typeError($from, $msg);
        }
    }
Validates value A and B, ensures they both are correctly typed, and of
the same type.

@param string   $from   String of function:argument_position
@param array    $types  Array of valid value types.
@param mixed    $a      Value A
@param mixed    $b      Value B