Incorrect parse with trim: true and utf16le encoding

[farisn]

Describe the bug

When using the trim: true option with utf16le encoding, the content is modified.

csv@5.5.3 contain csv-parse@4.16.3
Also reproduced for csv@6.1.3, csv-parse@5.2.0.

To Reproduce
In csv-parse@5.2.0:

const assert = require('assert')

const {parse: csvParse} = require('csv-parse/sync')

const data = 'ф, ы'
const encoding = 'utf16le'
const delimiter = ','
const record_delimiter = '\n'

const records = csvParse(Buffer.from(data, encoding), {
  //delimiter: Buffer.from(delimiter, encoding),
  //record_delimiter: Buffer.from(record_delimiter, encoding)
  encoding,
  trim: true
})

const correctRecords = data
  .split(record_delimiter)
  .map(
    record => record
      .split(delimiter)
      .map(str => str.trim())
  )
assert.deepStrictEqual(records, correctRecords)

Additional context

I need to parse utf16le encoded csv file with custom delimiter and record_delimiter. Please release bugfix also for csv-parse@4.16.3.

[wdavidw]

• csv-parse: 5.2.0 => 5.2.1
• csv: 6.1.3 => 6.1.4