Google Sheets API: Google arbitrarily rounds numeric values when requesting a range

I’m trying to retrieve a range of formulas/values from a sheet with official Google JS API, such that if cell contains a formula rather than a constant value, formula takes precedence over formula result. Everything worked (for a while) with this code:

const result = (await api.spreadsheets.values.get({
  spreadsheetId: SPREADSHEET_ID,
  range: `${SHEET_NAME}!${RANGE}`,
  dateTimeRenderOption: 'FORMATTED_STRING',
  valueRenderOption: 'FORMULA',
})).data.values || [];

Given this table

	A	B
1	name	value
2	some_name_1	0.33
3	some_name_2	0.66
4	some_name_3	=B2+B3

and range A2:B, the code above would correctly produce the following result:

const result = [
  ['some_value_1', '0.33'],
  ['some_value_2', '0.66'],
  ['some_value_3', '=B2+B3'],
];

However, once I changed constant numeric values to greater precision, Google would still round them to 2 decimal places on my own behalf… I.e., if I have this table

	A	B
1	name	value
2	some_name_1	0.333
3	some_name_2	0.666
4	some_name_3	=B2+B3

I would get the following (incorrect) result:

const result = [
  ['some_value_1', '0.33'],
  ['some_value_2', '0.67'],
  ['some_value_3', '=B2+B3'],
];

What I did try: changing the formatting of individual cells/the whole columns/the entire sheet to have more decimal places, and trying the same, but formatting everything as plain text. Both didn’t do anything.

At this point I’m out of ideas…