Unhandled exception. System.ArgumentException: Conversion buffer overflow.
   at System.Text.Encoder.Convert(Char* chars, Int32 charCount, Byte* bytes, Int32 byteCount, Boolean flush, Int32& charsUsed, Int32& bytesUsed, Boolean& completed)
   at System.Text.Encoder.Convert(ReadOnlySpan`1 chars, Span`1 bytes, Boolean flush, Int32& charsUsed, Int32& bytesUsed, Boolean& completed)
   at <Program>$.<Main>$(String[] args) in C:\Users\stoub\source\repos\ConsoleApp48\ConsoleApp48\Program.cs:line 4

using System;
using System.Text;

new IdentityEncoding().GetEncoder().Convert(new char[0], new byte[1000], false, out _, out _, out _);

sealed class IdentityEncoding : Encoding
{
    public override int GetByteCount(char[] chars, int index, int count) => count;

    public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
    {
        Span<char> span = chars.AsSpan(charIndex, charCount);
        for (int i = 0; i < span.Length; i++) bytes[byteIndex + i] = (byte)span[i];
        return charCount;
    }

    public override int GetCharCount(byte[] bytes, int index, int count) => count;

    public override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex)
    {
        Span<byte> span = bytes.AsSpan(byteIndex, byteCount);
        for (int i = 0; i < span.Length; i++) chars[charIndex + i] = (char)span[i];
        return byteCount;
    }

    public override int GetMaxByteCount(int charCount) => charCount;

    public override int GetMaxCharCount(int byteCount) => byteCount;

    public override byte[] GetPreamble() => Array.Empty<byte>();
}

Encoder.Convert throws for charCount == 0 #44247

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