Pipe operator only works in specific order

[Folyd]

cannot convert to string, the value is HELLO WORLD.

fn to_uppercase(text: str) -> str {
    return text.to_uppercase();
}

fn remove_spaces(text: str) -> str {
    return text.replace(" ", "");
}

fn count_chars(text: str) -> int {
    return len(text);
}

let result = "Hello World" 
    |> to_uppercase      // "HELLO WORLD"
    |> remove_spaces     // "HELLOWORLD"
    |> count_chars;      // 10

print(result); // 10

However, this works:

let result = "Hello World" 
    |> remove_spaces     // "HELLOWORLD"
    |> to_uppercase      // "HELLO WORLD"
    |> count_chars;      // 10

[Folyd]

let processed = "hello world" 
    |> str.trim()
    |> str.to_uppercase()
    |> str.replace("WORLD", "AISCRIPT");

print(processed); // "HELLO AISCRIPT"