feat: improve handling string or buffer

[easymikey]

Maybe it's worth switching to new standards for string or buffer processing? This will improve deno support.

From

const c of content.toString()

To

const c of new TextDecoder().decode(content)

[antonmedv]

Makes sense.

[easymikey]

Makes sense.

Reopen it?

[easymikey]

@antongolub what do you think? Should we add some context?

 const _content = Buffer.isBuffer(content)
    ? new TextDecoder().decode(content)
    : content;

Buffer.toString() vs TextDecoder.decode() performance

[antongolub]

Reasonable. Send a PR plz.