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In docs, rename "backwards compatibility" to "backward compatibility"
for consistency.
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@ -646,7 +646,7 @@ SELECT f1[1][-2][3] AS e1, f1[1][-1][5] AS e2
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If the value written for an element is <literal>NULL</> (in any case
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variant), the element is taken to be NULL. The presence of any quotes
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or backslashes disables this and allows the literal string value
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<quote>NULL</> to be entered. Also, for backwards compatibility with
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<quote>NULL</> to be entered. Also, for backward compatibility with
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pre-8.2 versions of <productname>PostgreSQL</>, the <xref
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linkend="guc-array-nulls"> configuration parameter can be turned
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<literal>off</> to suppress recognition of <literal>NULL</> as a NULL.
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