I marked this today in the title story of Cynthia Ozick's Dictation:
[Joseph Conrad's amanuensis, explaining to Henry James' amanuensis how she and Conrad work together, admits to secretly correcting Conrad when he misspeaks an English idiom.]
"All that is similar to my own experience with Mr. James. Mr. James, however, is beyond correction."
"Mr. James was not born in Poland."
"But he was born in America, which makes his intimacy with the English language all the more remarkable."