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𝕕𝕖𝕗𝕒𝕦𝕝𝕥 𝕞_𝕪𝕒𝕨
0.022

𝕞_𝕪𝕒𝕨 is changed to conform horizontal mouse movement to horizontal crosshair movement.

effective horizontal sensitivity ∝ 1/horizontal field of view
Horizontal field of view ∝ resolution

Hence, effective horizontal sensitivity ∝ 1/resolution

Therefore,
𝕖𝕗𝕗𝕖𝕔𝕥𝕚𝕧𝕖 𝕙𝕠𝕣𝕚𝕫𝕠𝕟𝕥𝕒𝕝 𝕤𝕖𝕟𝕤𝕚𝕥𝕚𝕧𝕚𝕥𝕪 = (𝕤𝕖𝕟𝕤𝕚𝕥𝕚𝕧𝕚𝕥𝕪 * 𝕞_𝕪𝕒𝕨) / 𝕣𝕖𝕤𝕠𝕝𝕦𝕥𝕚𝕠𝕟

For constant in-game sensitivity, the ratio of m_yaw and resolution must be maintained.
Hence, ((4/3)/(16/9))*0.022 = 0.0165 is the m_yaw for 4:3 resolution.

𝟜:𝟛 𝕤𝕖𝕟𝕤𝕚𝕥𝕚𝕧𝕚𝕥𝕪
For a constant resolution 4:3, to maintain constant effective horizontal sensitivity, product of in-game sensitivity and m_yaw must be maintained.

1.28 * 0.022 = new_sens * 0.0165
=> new_sens = 1.70666666667 ~ 1.71

𝕟𝕒𝕥𝕚𝕧𝕖 𝕤𝕖𝕟𝕤𝕚𝕥𝕚𝕧𝕚𝕥𝕪
Assuming that we change m_yaw to 0.022(default), when we go to 16:9 resolution -
native in-game sensitivity is the same as stretched in-game sensitivity, ie, 1.71

𝕫𝕠𝕠𝕞 𝕤𝕖𝕟𝕤 𝕣𝕒𝕥𝕚𝕠
0.818933027098955175 ~ 0.82