Panic when converting array to XML

[opax]

Describe the bug

When converting an array to XML, yq exits with a panic.

Version of yq: 4.29.2
Operating system: mac
Installed via: homebrew

Command

yq -o x . <<<'[5]'

Actual behavior

panic: runtime error: index out of range [1] with length 1

goroutine 1 [running]:
github.com/mikefarah/yq/v4/pkg/yqlib.(*xmlEncoder).encodeTopLevelMap(0x14000396d00, 0x0?, 0x140003acb40)
	github.com/mikefarah/yq/v4/pkg/yqlib/encoder_xml.go:95 +0x7ec
github.com/mikefarah/yq/v4/pkg/yqlib.(*xmlEncoder).Encode(0x14000396d00, {0x1033ff888?, 0x140000136c0?}, 0x140003aca00)
	github.com/mikefarah/yq/v4/pkg/yqlib/encoder_xml.go:68 +0x324
github.com/mikefarah/yq/v4/pkg/yqlib.(*resultsPrinter).printNode(0x14000396d00?, 0x0?, {0x1033ff888?, 0x140000136c0?})
	github.com/mikefarah/yq/v4/pkg/yqlib/printer.go:82 +0x100
github.com/mikefarah/yq/v4/pkg/yqlib.(*resultsPrinter).PrintResults(0x14000072540, 0x140003aa540)
	github.com/mikefarah/yq/v4/pkg/yqlib/printer.go:133 +0x568
...

Expected behavior

Either

• a proper error message ("Arrays cannot be converted to XML")
• or nothing (which is the current behavior for other not-representable data formats, e.g. yq -o x . <<< 5 does not output anything and signals no error)

[mikefarah]

Thanks - will fix in the next release. I think a proper error message is the right approach 👍🏼

[mikefarah]

Fixed in 4.30.1