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py/mpconfig: Enable io.IOBase at core feature level.

IOBase is quite an important building block of other parts of the system,such as `mpremote mount` and running .mpy and native tests.This feature costs +244 bytes of firmware size on ARM Thumb2 architectures,which is worth the cost for the extra features it enables.The change here means that `io.IOBase` is now enabled on all nrf boards,(previously it was only nRF52840 and nRF9160) and also B_L072Z_LRWAN1(there is no change to other ports or boards).Signed-off-by: Damien George <damien@micropython.org>

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- mpconfig.h

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`‎py/mpconfig.h`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1469,7 +1469,7 @@ typedef double mp_float_t;`
`1469`	`1469`
`1470`	`1470`	`// Whether to provide "io.IOBase" class to support user streams`
`1471`	`1471`	`#ifndefMICROPY_PY_IO_IOBASE`
`1472`		`-#defineMICROPY_PY_IO_IOBASE (MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_EXTRA_FEATURES)`
	`1472`	`+#defineMICROPY_PY_IO_IOBASE (MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_CORE_FEATURES)`
`1473`	`1473`	`#endif`
`1474`	`1474`
`1475`	`1475`	`// Whether to provide "io.BytesIO" class`

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Commitd01a981

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`‎py/mpconfig.h`

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