Reading PCM Audio from a Video Container

I can successfully read 16-bit PCM Audio data from a .wav file using the 'native' flag using audioread():

>> wav1 = audioread("audioOnly.wav", 'native');
>> whos wav1
  Name            Size              Bytes  Class    Attributes

  wav1      2868224x1             5736448  int16 

  
>> nfo1 = audioinfo('audioOnly.wav')
nfo1 = 

  struct with fields:

             Filename: '...\audioOnly.wav'
    CompressionMethod: 'Uncompressed'
          NumChannels: 1
           SampleRate: 44100
         TotalSamples: 2868224
             Duration: 65.0390929705215
                Title: []
              Comment: []
               Artist: []
        BitsPerSample: 16

>> [min(wav1) max(wav1)]
ans =

  1×2 int16 row vector

   -32768    32767

This results in the expected int16 data set.

However, if I attempt to apply the 'native' flag when reading audio from a video container such as .avi, I always seem to end up with a normalized single instead of an int16, just as if I was not applying the 'native' flag:

>> wav2 = audioread("audioVideo.avi", 'native');
>> whos wav2
  Name            Size               Bytes  Class     Attributes

  wav2      2868136x1             11472544  single              
  
>> nfo2 = audioinfo('audioVideo.avi')
nfo2 = 

  struct with fields:

             Filename: '...\audioVideo.avi'
    CompressionMethod: 'Uncompressed'
          NumChannels: 1
           SampleRate: 44100
         TotalSamples: 2868224
             Duration: 65.0390929
                Title: []
              Comment: []
               Artist: []
        BitsPerSample: 16
        
>> [min(wav2) max(wav2)]

ans =

  1×2 single row vector

              -1       0.9999695

I'm confident that that .avi container has 16-bit uncompressed PCM audio data (it was generated from the original .wav audio data) and I've verified this via ffmpeg externally from MATLAB.

...So what am I misunderstanding about why MATLAB is returning a single to me rather than the expected int16 native data?