You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/minijinja/minijinja-contrib/src/filters
    
    the code of the file until where you have to start completion: use std::convert::TryFrom;

use minijinja::value::Value;
use minijinja::{Error, ErrorKind};

#[cfg(feature = "datetime")]
mod datetime;

#[cfg(feature = "datetime")]
pub use self::datetime::*;

/// Returns a plural suffix if the value is not 1, '1', or an object of
/// length 1.
///
/// By default, the plural suffix is 's' and the singular suffix is
/// empty (''). You can specify a singular suffix as the first argument (or
/// `None`, for the default). You can specify a plural suffix as the second
/// argument (or `None`, for the default).
///
/// ```jinja
/// {{ users|length }} user{{ users|pluralize }}.
/// ```
///
/// ```jinja
/// {{ entities|length }} entit{{ entities|pluralize("y", "ies") }}.
/// ```
///
/// ```jinja
/// {{ platypuses|length }} platypus{{ platypuses|pluralize(None, "es") }}.
/// ```
pub fn pluralize(v: Value, singular: Option<Value>, plural: Option<V
    
pub fn pluralize(v: Value, singular: Option<Value>, plural: Option<Value>) -> Result<Value, Error> {
    let is_singular = match v.len() {
        Some(val) => val == 1,
        None => match i64::try_from(v.clone()) {
            Ok(val) => val == 1,
            Err(_) => {
                return Err(Error::new(
                    ErrorKind::InvalidOperation,
                    format!(
                        "Pluralize argument is not an integer, or a sequence / object with a \
                         length but of type {}",
                        v.kind()
                    ),
                ));
            }
        },
    };

    let (rv, default) = if is_singular {
        (singular.unwrap_or(Value::UNDEFINED), "")
    } else {
        (plural.unwrap_or(Value::UNDEFINED), "s")
    };

    if rv.is_undefined() || rv.is_none() {
        Ok(Value::from(default))
    } else {
        Ok(rv)
    }
}